How many cubic blocks of side length
7 inch would it take to fill a
cube with a side length of 7 inch?

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Calculate the areas of them:

area = l x w

area = 7 x 7 = 49

(Note : this is the area of the cubic block)

area = l x w

area = 7 x 7 = 49

Now divide them:

49/49 = 1

Thus, you could fit 1 cubic block in it.

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45

step-by-step explanation:

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!