A blue light flashes every 9 minutes and a red light flashes every 12 minutes. In how many minutes will they both flash?

36

Step-by-step explanation:

We need to find the LCM of both numbers. That is the least common multiple.

The prime factorization of is: . For it is .

So we multiply:

395.84

step-by-step explanation:

2πrh+2πr²

2 (pie)(radius)(height)+2(pie)(radius)^2

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13