How to change a subtration problem into a additon problem

Given only the number of users in 2005 and the fact that it triples each year, how did you determine the number of users in 2004?

Determine whether the pair of equations represent parallel lines, perpendicular lines, or neither. 12x + 4y = 16 24x + 8y = 36

I have a 5. In my ones place. The digit in my tens place is. 3 plus the digit in my ones place. The digit in my. Hundreds place is 2 less that the digit in my. Ones. Place. What number am I!

What is the answer to 7 (2e-1) - 3=6+6e

A simple random sample is free from any systematic tendency to differ from the population from which it was drawn. A. True B. False

Arithmetic and geometric

P=q + 5 2p + 3p = - 20 linear equations

If the mean weight of 3 outfielders on the baseball team is 194 lb and the mean weight of the 6 other players is 229 lb, what is the mean weight of the 9 -person team?

6x+3y=15 what is the ordered pair of the solution

Question: If each girl used one marshmallow per smore how many marshmallows were used in all? Show your work.