Waterfis tank at an increasing rate of 75 litres during the first hour, 1 tres during the second hour, 225 during the third hour and so on. the size of the tank is 200 dimensions in metres 20x9*3- 540 what is the capacity of the tank? tres 540 x 1000 = 540,000 submit part 1 mark unanswered b) how long does does it take to the tank rounded up to the nearest hour? hours

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!

54/3 is 18 so 18 is your answer

add -60 to 120 which will result in : 2x+3y=180

then subtract 2x: 3y=-2x+180

lastly, divide by 2: y= -2/3x+60

hope this is the answer you're looking for: )