Find the average (mean) of the following test scores. 83, 92, 47, 78, 80 and give me an explanation with your answer

add them all together then divide among them.

Add 83 + 92 + 47 + 78 + 80 = 380

then divide by the amount of test which is 5 because we have 5 test scores

divide 380 ÷ 5 = 76

The average percentage for all is 76%

Hope this helps :)

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!

can i see the following ?

step-by-step explanation: