Let's call the first number x, and the second number y. Putting what you have said into equation form:

Subtracting one equation from another gives:

If x = -5,

So the first number is -2, the second number is 9
If you translate it to English I’ll answer for you
Answer:
60 weeks
Step-by-step explanation:
Factor both numbers 12 and 15:
Find LCM(12,15). The common factor is only 3, multiply ths common factor by all factors that remain. Then

This means that the fewest number of weeks that will pass before both machines are cleaned again in the same week is 60 weeks.
The answer is $57.73 because you multiply 50.2 and .15 to get the tax. Then, you add the tax, which is $7.53. You add 7.53 and 50.20 to get the answer.
You have to substitute. So like number 1 is 3+5 because the value of t is three. 2. is -2.
3. is -9.
4 is 0.
5 is -12.
6 is 24.
7 is -96.
8 is 64.
9 is 7.
10 is 2.