KingAlex
Answered

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?


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Answer :

apologiabiology
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
arnfrs
First Question:

[tex]\frac{1}{4}(8-6x+12) = [/tex]
[tex]\frac{8}{4}-\frac{6x}{4}+\frac{12}{4} = [/tex]
[tex]2-\frac{3}{2}x+3 = [/tex]
[tex]\boxed{(D) -\frac{3}{2}x+5}[/tex]

Second Question:

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

Hope this helps :D



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