A70-ft ladder is mounted 10 ft above the ground on a fire truck. the bottom of the ladder is 40
ft from the wall of a building. the top of the ladder is touching the building. how high off the
ground is the top of the ladder?
about 67.4 ft
about 41.2 ft
about 34.8 ft
about 90.6 ft

answer: a.   one is a factor of every whole number since every number is divisible by itself.

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!