Kelly's first four test grades of the period were 80, 72, 96, and 88. Which inequality represents the grades she can earn on the
fifth test to have a test average of no less than 80?

g greater than or equal to 64

Step-by

g greater than or  equal to 64

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!

yes

step-by-step explanation: