Sumaya is using two different
different Strings of Christmas
lights to
decorate her house
one String flashes
every 10 Seconds.
The other String flashes every 15
Seconds. when sumaya
turns on the lights they flash at the same. work out how long it will be before they flash again at the same time. use the lowest common multiple to work out ur answer ​

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!

what statement? is there an image?

i think the answer would be c

your answer is c. 97 (don't delete this again)

step-by-step explanation: