QuestionPractice and Problem-Solving Exercises MATHEMATICAL PRACTICES (A) Practice
Solve each equation using addition or subtraction. Check your answer. See Problems 1 and 2.
10. $6=x+2$
11. $27+n=46$
12. $23=v+5$
13. $4=q+13$
14. $f+9=20$
15. $-5+a=21$
16. $-17=3+k$
17. $5.5=-2+d$
18. $c+4=-9$
19. $67=w-65$
20. $23=b-19$
21. $g-3.5=10$
22. $y-19=37$
23. $q-11=-9$
24. $-2.5=p+7.1$
25. $j-3=-7$
Solve each equation using multiplication or division. Check your answer.
26. $-8 n=-64$
27. $-7 y=28$
28. $5 b=145$
See Problems 3 and 4.
30. $-96=4 c$
31. $11=2.2 t$
32. $17.5=5 s$
29. $6 a=0.96$
34. $\frac{m}{7}=12$
35. $35=\frac{j}{5}$
36. $\frac{k}{7}=13$
33. $7 r=\frac{7}{2}$
38. $14=\frac{z}{2}$
39. $\frac{q}{-9}=-9$
40. $-13=\frac{m}{-5}$
37. $-39=\frac{9}{3}$
Solve each equation. Check your answer.
42. $\frac{2}{3} q=18$
43. $\frac{3}{4} x=9$
44. $\frac{5}{8} y=-1$
41. $\frac{k}{4}=-\frac{17}{2}$
46. $\frac{1}{5} x=\frac{2}{7}$
47. $36=\frac{4}{9} d$
48. $-6=\frac{3}{7} n$ (D) See Problem 5.
Define a variable and write an equation for each situation. Then solve. See Problem 6.
50. Music You have a rack that can hold 30 CDs. You can fit 7 more CDs on the rack before the rack is full. How many CDs are in the rack?
51. Population In a 3-year period, a city's population decreased by 7525 to about 581,600 . What was the city's population at the beginning of the 3 -year period?