20men can dig a trench in 15hours, how many men can dig the same trench in 10 hours if they work at the same rate?

7 hours 30 mins (7.5hrs)

Step-by-step explanation:

15 / 2 = 7.5

15 hours =20men

1 hour =20/15 men

1hour =4/3 men

10 hours =40/3men

Aprrox 13 men

there is no grid

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!