Final answer:
To solve for x when f(x)=158 for the function f(x)=70+11x, subtract 70 from 158 and divide the result by 11, which reveals that x equals 8.
Step-by-step explanation:
To find the value of x when f(x) = 158, we need to substitute 158 for f(x) in the given function and solve for x:
f(x) = 70 + 11x
158 = 70 + 11x
To find the value of x, deduct 70 from both sides:
158 - 70 = 11x
88 = 11x
Now, divide both sides by 11:
x = 88 / 11
x = 8
Therefore, the correct answer is B. 8.