You have two strands of decorative lights. Strand A changes color every
18 seconds and Strand B changes color every 42 seconds. Both strands just changed color. After how many seconds will the strands change color at
the same time again?

Both strands will change color at 126 seconds.

Step-by-step explanation:

In this case, find the least common mutiple or LCM.

EXAMPLE OF LCM:

There are two integers a and b marked as LCM ( a, b ), the LCM is the smallest positive integer that can be divisible by both a and b.

So LCM(18,42) =

The LCM is 126, it is the least common multiple.

-4

step-by-step explanation:

do 6-10=

if u need it to be negative.

so far i think you have the right thing going for you just remember soh cah toh

step-by-step explanation:

sine over hypotenuse

cosine   equals adjacent

tangent over hypotenuse