Answer:
5.
Step-by-step explanation:
x/y = 0.5
x/10 = 0.5
x = 10*0.5 = 5.
Explanation:
<u>Equation</u>:
f(- 3) = 18
Substitute x = - 3 into f(x) , that is
f(- 3) = 2(- 3)² = 2(9) = 18