How to prove cross multiplication method of solving linear equation with 2 variables?

9.4 * 10-4 = 0.00094 0.0094 94,000 940,000

If my salary increase by 25% each year, in 4 years, I will earn exactly twice as much as I do now

A soccer field is a rectangle 90 meters wide and 120 meters long. The coach asks the players to run from one corner to the corner diagonally across the field. How far do the players run.

How many times does 3 go into 63

Determine the general form of the equation for the circle x^2 + (y + 1) ^2 = 2.

Use the information given to identify the a_9 term of the geometric sequence: a_4=1/2, r=1/2

A cubed shaped shipping crate has a volume of 27 cubic feet what are the dimensions of the crate

A submarine dived 600 feet below sea level and marked its position at - 600. It later rose by 200 feet. What integer represents the new position of the submarine?

There are 5 boys and 4 girls in a class. In how many ways can they be seated in a row of 9 chairs such that at least 3 girls are all next to each other?

155% is equivalent to what fraction in reduced terms