Which of the following is an x intercept of the function? f(x)= x^3-5x^2-8x+48 a) 4 b) -4 c) 2 d) -2

A) 4

Step-by-step explanation:

The given function is

If , then is an x-intercept of

Let us substitute x=4 and simplify:

This implies that:

Therefore 4 is an x-intercept of

Also, f(-4)=64, f(2)=20, and f(-2)=36.

This means that, -4, 2, and -2 are not x-intercepts

b.) 160 miles on a 5 gallons car

step-by-step explanation:

240/10=24 miles/gallon

160/5=32 miles/gallon

30/1=30 miles/gallon

168/6= 28 miles/gallon

32 miles/gallon is the most amount, so this is the best.

step-by-step explanation: