Math Snap

STEP 1

What is this asking?
We need to find the total cost of some fast food, first with specific numbers of fries and drinks, and then with variables representing any number of fries and drinks.
Watch out!
Don't mix up the prices of the fries and drinks!
Also, make sure to clearly distinguish between the cost of a single item and the total cost of multiple items.

STEP 2

1. Calculate the cost of 3 fries and 5 drinks.
2. Create a formula for f fries and d drinks.

STEP 3

Alright, let's start with the fries!
We're getting 3 orders of fries, and each one costs $\$1.20$.
So, we multiply $3$ by $\$1.20$ to get the total cost of the fries:
$$3 \cdot \$1.20 = \$3.60$$

STEP 4

Now for the drinks!
We're getting 5 drinks, and each one costs $\$0.96$.
Let's multiply to find the total cost of the drinks:
$$5 \cdot \$0.96 = \$4.80$$

STEP 5

Time to combine!
The total cost of the fries is $\$3.60$, and the total cost of the drinks is $\$4.80$.
We add those together to get the overall total cost:
$$\$3.60 + \$4.80 = \$8.40$$ So, 3 orders of fries and 5 drinks will cost us $\$8.40$!

STEP 6

Now, let's get fancy with some variables!
If we buy $f$ orders of fries at $\$1.20$ each, the total cost of the fries is:
$$f \cdot \$1.20 = \$1.20f$$ See how we just put the $f$ next to the $\$1.20$?
That's how we show multiplication with variables.

STEP 7

Same idea for the drinks!
If we buy $d$ drinks at $\$0.96$ each, the total cost of the drinks is:
$$d \cdot \$0.96 = \$0.96d$$

STEP 8

To get the total cost of f fries and d drinks, we just add the two expressions we just found:
$$\$1.20f + \$0.96d$$ This formula tells us the total cost no matter how many fries and drinks we buy!

3 fries and 5 drinks cost $\$8.40$.
The formula for the cost of $f$ fries and $d$ drinks is $\$1.20f + \$0.96d$.