Answer:

Step-by-step explanation:
We want to solve for
in 
We expand to get:
We group similar terms to get:

This simplifies to 
Divide both sides by 7.8 to get

Answer:
D.
24x + 18y ≤ 225
x + y ≥ 10
Step-by-step explanation:
"He wants to frame no fewer than 10"
x + y ≥ 10
"and he can spend a maximum of $225. Large frames cost $24, and medium frames cost $18."
24x + 18y ≤ 225
Answer:
D.
24x + 18y ≤ 225
x + y ≥ 10

the earned interest will then be A - P, namely A - 17000.