Two neon signs are turned on at the same time. both signs blink as they are turned on.
one sign blinks every 9 seconds. the other sign blinks every 15 seconds. in how many
seconds will they blink together again?

45 seconds

Step-by-step explanation:

Find the least common multiple (LCM) of 9 and 15.  To do that, first write the prime factorization of 9 and 15.

9 = 3²

15 = 3 × 5

The LCM must contain all the factors of each.

LCM = 3² × 5

LCM = 45

They blink together after 45 seconds.

47

step-by-step explanation:

question 1 is 8, question 2 is 9, question 3 is 24

step-by-step explanation:

now, the numbers they give you at the top are the key. from there, you just have to plug and chug! let's try 1, 2, and 3!

key: a=3, b=5, c=6

1. a+5

remember, a=3, so we plug that in to get 3+5=8

2. 15-c

c=6, so we plug that in to get 15-6=9

3. 4b

b=6, so we plug it in to get 4*6=24

time to try the rest on your own! if you put the answers below in a comment, i'll check them for you!