13. A group of 169 students needs to be seated in a square formation for a yearbook photo. Solve the equation 169= s^2 to find how many students should be in each row.

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!

the first option is the answer.

the answer is $42.96

step-by-step explanation:

i would think "anyone would want the best for their child" is correct