Which expression is equivalent to 1/4(8-6x+12)?
a) 7/2x
b)-13/2
c)-6x+14
d)-3/2x+5
an airplane's altitude changed -378 feet over 7 minutes. what was the mean change of altitude in feet per minute?
work

So which is equivilent
pemdas

(8-6x+12)
(20-6x)
multiply/distribute
1/4(20-6x)
5-6/4x=5-3/2x=-3/2x+5

the answer is D

so mean is equivilent to average

per minute means x feet for every one minute=xfeet/1miin=x/1

so just divide
-378/7=-54

mean change in altitude
-54 feet per minute

First Question:






Second Question:

The average (mean) rate of change is just

Hope this helps :D

Hope i can you!