Please help I will really appreciate it

Step-by-step explanation:

Elevator's starting point = -90ft

Elevator's position after 15s = -20ft

The elevator did move upwards as

-20ft. > -90ft.

Distance covered by the elevator = -20 + -90

= -20 + 90

= 70ft.

Time = 15s

Speed = distance/time

= 70/15

= 4.7ft/s

5x + 5

step-by-step explanation:

you should always add the diagrams and graphs we cannot see. this particular question is kind of borderline because we can make a graph for you.

(f + g)x = -x^2 +3x + 5 + x^2 + 2x

(f + g)x = 5x + 5

the graph of z = 5x + 5 is shown below. always use desmos when in doubt.