Natural Numbers

Problem 401

Find the volume of a sphere with radius r=1r=1. Round the volume to the nearest hundredth.

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Problem 402

Evaluate the expression (32)4\left(3^{2}\right)^{4} and select the correct answer. A) (3×3)(3×3×3×3)(3 \times 3)(3 \times 3 \times 3 \times 3) B) (3×3×3×3×3×3)(3 \times 3 \times 3 \times 3 \times 3 \times 3) C) (3×3)(3×3)(3×3)(3×3)(3 \times 3)(3 \times 3)(3 \times 3)(3 \times 3) D) (3×3×3×3)(3×3×3×3)(3 \times 3 \times 3 \times 3)(3 \times 3 \times 3 \times 3)

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Problem 403

Find the unknown value in the proportions: (a) a:6=7:2a: 6=7: 2 and (b) 5:4=b:205: 4=b: 20.

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Problem 404

Find the areas and volumes of a round 11-inch and 8-inch by 10-inch rectangular pan. Determine which has the larger volume.
a) Area of round pan: π(11/2)2\pi (11/2)^2 Area of rectangular pan: 8×108 \times 10 b) Volume of round pan: π(11/2)2×2\pi (11/2)^2 \times 2 Volume of rectangular pan: 8×10×28 \times 10 \times 2 c) Compare the volumes to determine the larger pan.

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Problem 405

Find the value of (a)2(\sqrt{a})^{2} for any nonnegative real number aa.

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Problem 406

Divide the expression v293v+v2+6v+96v\frac{v^{2}-9}{3 v}+\frac{v^{2}+6 v+9}{6 v}.

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Problem 407

Simplify the expression 22+932^{2} + \sqrt{9} \cdot 3 using the order of operations.

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Problem 408

Solve the quadratic equation 3x2+8x1=03x^2 + 8x - 1 = 0 and select the correct solution set.

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Problem 409

Solve for the variable vv given the equation 25.6=v225.6=\frac{v}{2}.

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Problem 410

Find the total number of people in the senior center dining room if 3/5 of them are men and there are 93 men.
Let pp be the total number of people.
Equation: p=9335p = \frac{93}{\frac{3}{5}}

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Problem 411

Solve for ww in the equation 5+w=7-5+w=7.

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Problem 412

Expand and simplify polynomial expressions, including binomial squares, products, and factorials. Determine equivalence of expanded polynomial expressions.
2x(3x5x2+4y)2 x(3 x-5 x^{2}+4 y) (x+4)2(x+4)^{2} (3x4)(2x+5)(3 x-4)(2 x+5) (x+1)(x2+2x3)(x+1)(x^{2}+2 x-3) 4x(x+5)(x5)4 x(x+5)(x-5) 2a(a+4)2-2 a(a+4)^{2} (x+2)(x5)(x2)(x+2)(x-5)(x-2) (2x+1)(3x5)(4x)(2 x+1)(3 x-5)(4-x) (9a5)3(9 a-5)^{3} (ab+cd)(a+bcd)(a-b+c-d)(a+b-c-d)

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Problem 413

Find the positive value of pp that satisfies the equation 4p2+288=0\sqrt{4p^2 + 28} - 8 = 0.

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Problem 414

Rewrite interval with given values: p^=0.61,z=0.82,SEest=0.00157\hat{p} = 0.61, z^* = 0.82, SE_{\text{est}} = 0.00157. The interval is [0.607,0.613][0.607, 0.613].

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Problem 415

Find the decimal representation of 65\sqrt{65} rounded to two decimal places.

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Problem 416

Solve for yy in the equation 5y23+7=275 y^{\frac{2}{3}} + 7 = 27.

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Problem 417

Find the area of a town with an area of 4.364.36 square miles, given that 11 mile =1,760=1,760 yards. The correct answer is 13,505,53613,505,536 square yards.

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Problem 418

Find the product of 9.2 and 9 1/2.

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Problem 419

Solve the linear equation 3x+5=9x+83x + 5 = 9x + 8 for the unknown variable xx.

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Problem 420

Determine if all numbers are solutions to the inequality 609>3×5\frac{60}{9} > 3 \times 5.

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Problem 421

Find the sum of two linear functions h(n)=2n4h(n) = 2n - 4 and g(n)=n2g(n) = n - 2.

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Problem 422

Solve the quadratic equation 7x22x+6=0-7x^2 - 2x + 6 = 0 and find its roots.

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Problem 423

Find the unit that is to litre as gallon is to meter.
A yard =k meterA \text{ yard } = k \text{ meter} A gallon =x litreA \text{ gallon } = x \text{ litre}

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Problem 424

Find 4% of 250.

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Problem 425

Find inverse function f1(x)f^{-1}(x) of f(x)=3x+4f(x)=3x+4, then verify f(f1(x))=xf(f^{-1}(x))=x and f1(f(x))=xf^{-1}(f(x))=x.

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Problem 426

Show that if aa and bb are relatively prime, then gcd(da,db)=d\operatorname{gcd}(da, db) = d for any positive integer dd.

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Problem 427

Divide 256256 by 2424 and write the result.

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Problem 428

Solve for xx given the equation 4x=4.564x = 4.56.

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Problem 429

Simplify the expression: 12x1+x77x2x1\frac{1-2 x}{1+x} * \frac{-7-7 x}{2 x-1}.

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Problem 430

Solve for ww in the formula v=13wbv = \frac{1}{3} w b.

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Problem 431

Simplify the expression (b12)3(b^{12})^{3} and write the answer as a power.

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Problem 432

Express 16sin(50r)sin(23r)16 \sin (50 r) \sin (23 r) as a sum or difference of trigonometric functions.

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Problem 433

Solve for nn if P(n,2)=1482P(n, 2)=1482. Alicia's formula is n2n1482=0n^{2}-n-1482=0. Explain how she created the formula and use it to solve for nn.

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Problem 434

Express quadratic functions in standard form, find y-intercept. a) f(x)=3x(x4)f(x)=3x(x-4), c) f(x)=2(x4)(3x+2)f(x)=2(x-4)(3x+2), b) f(x)=(x5)(x+7)f(x)=(x-5)(x+7), d) f(x)=(3x4)(2x+5)f(x)=(3x-4)(2x+5).

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Problem 435

Find the value of pp that satisfies the equation 6p+46=4p83\frac{6p+4}{6}=\frac{4p-8}{3}.

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Problem 436

Identify the critical points of y=x2exy=x^{2}e^{x}. State the xx- and yy-coordinates. Determine if they are local max, min, or neither.

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Problem 437

Convert 34\frac{3}{4} pound to ounces.

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Problem 438

Verify cos2xsec2x+tan2x=sec2x\cos^2 x \sec^2 x + \tan^2 x = \sec^2 x by transforming the left side.

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Problem 439

Analyze exponential growth/decay functions: y=(32)xy=(\frac{3}{2})^{x}, y=4(0.5)xy=-4(0.5)^{x}, y=4(0.25)xy=4(0.25)^{x}, y=2(2)xy=-2(2)^{x}. Determine growth/decay, y-intercept, asymptote.

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Problem 440

Find the inverse of the one-to-one functions gg and hh, where g={(1,3),(3,1),(4,7),(6,8),(7,6)}g=\{(1,3),(3,-1),(4,-7),(6,8),(7,6)\} and h(x)=x135h(x)=\frac{x-13}{5}. Determine g1(6)g^{-1}(6), h1(x)h^{-1}(x), and (hh1)(4)\left(h \circ h^{-1}\right)(-4).

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Problem 441

Engineers must design helmets to fit the normal distribution of male head breadths with μ=6.1\mu = 6.1-in and σ=1.2\sigma = 1.2-in.
Find the middle 99%99\% of head breadths: Between 3.713.71-in and 8.498.49-in.
Find the middle 99%99\% of sample averages for head breadths of size 6060: Between 5.865.86-in and 6.346.34-in.

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Problem 442

Convert 6 tons to pounds. Solve for the unknown value that, when multiplied by 6, equals 12,000 pounds.

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Problem 443

Translate the phrase "42 decreased by twice Vanessa's age" into an algebraic expression using the variable vv to represent Vanessa's age.

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Problem 444

Solve for yy in the equation 63=2y2+9-63=-2 y^{2}+9, expressing the answer as an integer or in simplest radical form.

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Problem 445

Solve the linear equation 4b+6=2b+44b + 6 = 2 - b + 4 and select the correct solution.

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Problem 446

Find the quotient of -16 divided by -2, or state if undefined. 162=\frac{-16}{-2}=\square

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Problem 447

Find the minimum yy-value of f(x)=x2+2xf(x)=x^{2}+\frac{2}{x} on 12x2\frac{1}{2} \leq x \leq 2.

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Problem 448

Find the number of oranges between 3 oz and 5 oz in a batch of 2300, given a normal distribution with μ=6\mu = 6 oz and σ=1.5\sigma = 1.5 oz.

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Problem 449

Find the solution, rounded to one decimal place, to the equation ex=x+8e^{x} = \sqrt{x+8} using a graphing calculator.

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Problem 450

Solve the linear inequality 18<4m1518 < 4m - 15 for the variable mm.

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Problem 451

Find the equation that represents "three minus the difference of a number and one equals one-half of the difference of three times the same number and four".
3(n1)=12(3n4)3 - (n - 1) = \frac{1}{2}(3n - 4)

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Problem 452

Solve the equation 5x3=45^{\frac{x}{3}}=4. The exact solution is x=log5(4)x=\log_5(4). The approximate solution, rounded to 4 decimal places, is x=3.0910x=3.0910.

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Problem 453

Find the error in Jane's solution of the quadratic equation x25x24=0x^2 - 5x - 24 = 0 using the quadratic formula.

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Problem 454

Find the range of xx values where the function f(x)=x3+3x29x+7f(x) = x^3 + 3x^2 - 9x + 7 is increasing.

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Problem 455

Convert the total surface area of Africa, approximately 11,700,000 square miles, to scientific notation.

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Problem 456

Solve the linear equation 6x+6=06x + 6 = 0 for the unknown variable xx.

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Problem 457

1. Find the antiderivative of f(x)f(x): a) f(x)=4x3+3x4f(x)=4x^3+3x^4 b) f(x)=110x410x4f(x)=\frac{1}{10}x^4-\frac{10}{x^4} e) f(x)=2ex+1f(x)=2e^x+1 f) f(x)=13exx22f(x)=\frac{1}{3}e^x-\frac{x^2}{2}
2. Find the antiderivative of f(x)f(x): a) f(x)=(3x1)2f(x)=(3x-1)^2 b) f(x)=3(5x+1)4f(x)=\frac{3}{(-5x+1)^4} e) f(x)=e4x1f(x)=e^{4x-1} f) f(x)=25e25xf(x)=\frac{2}{5}e^{2-5x} i) f(x)=6xf(x)=\sqrt{6x} j) f(x)=913xf(x)=\sqrt{9-\frac{1}{3}x}

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Problem 458

Find a recursive formula for the number of seats in each row of a movie theater, where the explicit formula is an=6+6na_{n}=6+6 n and nn represents the row number.

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Problem 459

Find the value of xx in the system of linear equations 15x+7y=415x + 7y = 4, 5x7y=2-5x - 7y = 2, and 10x=210x = 2. Enter the answer as a simplified fraction.

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Problem 460

Plot the quadratic equation y=x2+10x+21y = x^{2} + 10x + 21 and find its roots using the graph.

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Problem 461

Evaluate the factorial ratio 16!13!\frac{16 !}{13 !}. The solution is \square.

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Problem 462

Find the value of nn that satisfies the equation n×34=316n \times \frac{3}{4} = \frac{3}{16}.

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Problem 463

Graph the set of all (x,y)(x, y) satisfying x+2y>2x + 2y > 2.

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Problem 464

Find the degree of the polynomial equation 2x56x4=02 x^{5} - 6 x^{4} = 0.

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Problem 465

Solve for h in the equation 7x+4=7x+h7x + 4 = 7x + h to find the value of h that results in zero solutions.

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Problem 466

Solve for ff by completing the square: 2f256f+34=02f^2 - 56f + 34 = 0. Express your answers as integers, simplified fractions, or rounded decimals.

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Problem 467

Divide 4x316x2+18x284x^3 - 16x^2 + 18x - 28 by x+3-x + 3 using long division. Find the quotient and remainder.

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Problem 468

Find α\alpha and β\beta values in cos(αβ)\cos(\alpha-\beta) expression. Write as cos()\cos(\square^\circ) and find exact value.

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Problem 469

Find all real numbers xx that satisfy the equation cosx=15\cos x = 15.

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Problem 470

Solve for the missing value in the proportion 44:20=:544: 20 = \square: 5.

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Problem 471

Solve for xx in the inequality 3x7>7x+93x - 7 > 7x + 9 and graph the solution.

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Problem 472

Greg used 31/431/4 feet of cloth for shorts and 22/322/3 feet for a shirt. Which expression gives the total cloth used?

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Problem 473

Find the value of bb that satisfies the equation 14b+23b=40b14_b + 23_b = 40_b, where b{4,5,7}b \in \{4, 5, 7\}.

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Problem 474

Find the number xx such that x+5/x=6x + 5/x = 6.

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Problem 475

Solve for y: y+44=0\sqrt{y+4}-4=0

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Problem 476

Determine if half of all teens aged 13-17 have made new friends online using a 0.05 significance level and the normal distribution.
H0:p=0.5H_0: p = 0.5 H1:p0.5H_1: p \neq 0.5

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Problem 477

Find the gradient of the line segment connecting the points C(5,6)C(-5,6) and D(2,1)D(2,-1).

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Problem 478

Evaluate the expression x2+4y÷2w+3zx^{2} + 4y \div 2w + 3z when w=1,x=4,y=7,z=0w=1, x=4, y=7, z=0.

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Problem 479

Find the value of the 4 digit in the number 2.34five2.34_{\text{five}} expressed as a fraction or in words.

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Problem 480

Demarco substitutes a value for xx in 12x=4\frac{1}{2} x=4. How can Demarco determine if the value is a solution?

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Problem 481

Multiply and simplify the expression 6xy3z3x2yx26 x y^{3} z \cdot 3 x^{2} y x^{2}.

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Problem 482

Solve the rational equation 4x+42x1=4x2+3x4\frac{4}{x+4}-\frac{2}{x-1}=\frac{4}{x^{2}+3x-4}.

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Problem 483

Polygraph experiment has 99 results: 22 wrong, 77 correct. Test if correct results are <80% using 0.05 significance. Find null/alt hypotheses, test statistic, P-value, conclusion.
H0:p=0.80,H1:p<0.80H_0: p = 0.80, H_1: p < 0.80 Test statistic z=0.55z = -0.55 P-value = 0.2912 (rounded to four decimal places)

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Problem 484

Estimate the absolute uncertainty for the result of the calculation: 157.2±6.059.3±1.9122.0±1.1=0.802459\frac{157.2 \pm 6.0 - 59.3 \pm 1.9}{122.0 \pm 1.1} = 0.802459.

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Problem 485

Solve for the integer value(s) of nn in the equation 62=8n2+10-62=-8 n^{2}+10.

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Problem 486

Simplify 3u+3u=423u + 3u = 42 to find the value of uu.

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Problem 487

Radioactive substance decreases by 1/3 each year. Find recursive formula for amount left after nn years, where initial amount is 1,452 g1,452 \mathrm{~g}. Is the sequence arithmetic or geometric?

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Problem 488

Jim is computing 353^{5} on a calculator, but gets an incorrect answer of 2,187. What is the correct operation to fix the error?

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Problem 489

Find the doubling time of an economic indicator increasing at 3% per year. Discuss the validity of the doubling time formula. Calculate the indicator's increase over 5 years.
Doubling time=ln2r\text{Doubling time} = \frac{\ln 2}{r}, where rr is the growth rate. Determine if this formula is appropriate for the given case.

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Problem 490

Solve x2+28x=5x^{2}+28x=5 by completing the square. Select the correct answer: A) x=14±191x=14 \pm \sqrt{191} B) x=14±191x=-14 \pm \sqrt{191} C) x=14±201x=-14 \pm \sqrt{201} D) x=14±201x=14 \pm \sqrt{201}

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Problem 491

Simplify the equation 2(3v+4)=262(3v+4)=26 to find the value of vv.

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Problem 492

Find the least common denominator (LCD) of the rational expressions xx24,3x,984x\frac{x}{x^{2}-4}, \frac{3}{x}, \frac{9}{8-4x}. The LCD is (x24)x(84x)x(84x)\frac{(x^{2}-4)x(8-4x)}{x(8-4x)}.

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Problem 493

Solve for y, where 6 is greater than or equal to (y/8) - 4.

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Problem 494

Solve the system of linear equations 4xy=114x - y = 11 and x+y=4x + y = 4 using the elimination method. The system has no solution.

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Problem 495

Find the solutions to the equation 4x+21=(13)x+4+64x+21=-\left(\frac{1}{3}\right)^{x+4}+6.

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Problem 496

Find the cost of 4 potted plants and 5 bags of compost given the costs of 7 plants + 2 compost and 3 plants + 4 compost.
Cost of 7 potted plants and 2 bags of compost: £41£ 41 Cost of 3 potted plants and 4 bags of compost: £27£ 27

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Problem 497

Compare the doubling times using approximate and exact formulas. Find the population after 30 years if a nation of 100 million grows at 9%9\% per year.
The approximate doubling time is ln(2)ln(1.09)\frac{\ln(2)}{\ln(1.09)} \approx \square years and the exact doubling time is ln(2)ln(1.09)\frac{\ln(2)}{\ln(1.09)} \approx \square years.

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Problem 498

Solve for the value of ff that satisfies the inequality 21>1317f-21 > 13 - 17f.

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Problem 499

Simplify the expression 25a24b225 a^{2} - 4 b^{2} to find the preferred form.

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Problem 500

Verify identity 1cosθsinθ+sinθ1cosθ=2cscθ\frac{1-\cos \theta}{\sin \theta}+\frac{\sin \theta}{1-\cos \theta}=2 \csc \theta. Simplify numerator 1+sin2θ1+\sin^2 \theta.

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