Question

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 PLEASE

Answer 1

First Question:


`(1)/(4)(8-6x+12) =`

`(8)/(4)-(6x)/(4)+(12)/(4) =`

`2-(3)/(2)x+3 =`

`\boxed{(D) -(3)/(2)x+5}`

Second Question:

The average (mean) rate of change is just
`(-378)/(7) =\boxed{-54 ft/min}`

Hope this helps :D

Answer 2

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