Question

Give the function:

f (x)= -2x+4, 0 (greater or less than) x (greater or equal to) 8
-5x+11, x (less than or equal to) 8

(I have soo much trouble with these!)

Answer 1

^^contiued question

Is the function increasing or decreasing over the interval [2,7]?

Answer 2

f(x) =
{ -2x+4 for x≤0 or x≥8
{ -5x+11 for 0 < x < 8

so, on the interval [2,7] the slope is -5, so decreasing

You should always graph functions if you are not sure.