Phil is 20, Steve is 21, and Esther is 19. Steve is the oldest
Answer:
$50
Step-by-step explanation:
Given data
Let the total purchase be x
Hence 30% of x is $15
Let us find the value of x
30/100*x= 15
0.3*x=15
0.3x=15
x= 15/0.3
x= $50
Hence the purchase is $50
Answer:

Step-by-step explanation:
Let f and g be two functions that are defined in the same interval and have the same independent variable. Then, the Subtraction of Function is defined as:

Let's solve (f-g)(x) with
and 

.
Answer:
x=12
Step-by-step explanation: