F(x) = 5x
for f(7) you replace x with 7 so it will be : f(7) = 5(7) = 35
Answer:
a) In 5 weeks he would have $50
b)w | m
1 : $10
2: $20
3:$30
Step-by-step explanation:
Given is a piecewise function which follows different expressions according the the value of input x.
Given 
It says to find f(-4) i.e. the value of function f(x) at x = -4.
At point x = -4, f(x) is x³, if -5 ≤ x ≤ 2.
So, f(-4) = (-4)³
f(-4) = -4 × -4 × -4
f(-4) = -64.
Hence, option A is correct i.e. -64.
2x+9<0
This is asking for numbers below 0
x>-12
This is asking for numbers above - 12
So the numbers which would fit in both of these rules would be:
-11, -10, -9, -8, -7, -6, -5
Any numbers above or below these wouldn't fit into any of the inequalities