One evening decreased by 5 degrees farenheit during the first hour after sunset, and then decreased by 2 degrees each hour for the next 7 hours. The temperature increased by 14.5 degrees the next morning and then increased by 11 degrees that afternoon. What was the total change in temperature?

answer: 15

step-by-step explanation:

you can first factor out the n to get n(1+5). we know that 1+5 is 6, so we just have 6n.

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!

step-by-step explanation: s