First, let's make some variables then make an expression.
Let x = the number of pizzas
Let y = the number of salads
Then 12x = the price for x pizzas
Then 2y = the price y pizzas
Now we can make our expression.
We combine the costs for the pizzas and salads and delivery charge is added.
12x + 2y + 3
Now we have our expression. Replace the x with how many pizzas you bought and replace the y with how many salads you bought.
How much would 6 pizzas and 3 small salads would cost?
12(6) + 2(3) + 3 =
72 + 6 + 3 =
78 + 3 =
81
The answer to this question is $81.
EDIT:
I want to give a thank you to Irspow for finding my error!
Step-by-step explanation:
8x² + 8x - 21 = 0
8(x² + x) - 21 = 0
8(x + 0.5)² - 23 = 0
8(x + 0.5)² = 23
(x + 0.5)² = 23/8.
Maybe just leave it and ask about it later
After 75% increase followed by a 33 1/2% decrease the net increased is 16.375%.
<u>Solution:</u>
Need to determine net percentage increase or decrease when a value is increased by 75% and then decreased by 
that is 33.5%.
Let’s assume initial value be represented by variable x.
Now there is decrease of 33.5%
Hence after 75% increase followed by a decrease the net increased is 16.375%.
