QuestionAt the fast food restaurant, an order of fries costs \$1.20 and a drink costs \$0.96. How much would it cost to get 3 orders of fries and 5 drinks? How much would it cost to get \(f\) orders of fries and \(d\) drinks?
Answer Attempt 1 out of 2
Total cost, 3 orders of fries and 5 drinks:
Total cost, orders of fries and drinks:
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Studdy Solution
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 .
So, we **multiply** by to get the **total cost** of the fries:
STEP 4
Now for the drinks!
We're getting 5 drinks, and each one costs .
Let's **multiply** to find the **total cost** of the drinks:
STEP 5
Time to **combine**!
The **total cost** of the fries is , and the **total cost** of the drinks is .
We **add** those together to get the overall **total cost**:
So, 3 orders of fries and 5 drinks will cost us !
STEP 6
Now, let's get fancy with some variables!
If we buy orders of fries at each, the **total cost** of the fries is:
See how we just put the next to the ?
That's how we show multiplication with variables.
STEP 7
Same idea for the drinks!
If we buy drinks at each, the **total cost** of the drinks is:
STEP 8
To get the **total cost** of *f* fries and *d* drinks, we just **add** the two expressions we just found: This formula tells us the total cost no matter how many fries and drinks we buy!
STEP 9
3 fries and 5 drinks cost .
The formula for the cost of fries and drinks is .
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