How to do substitution method

Which measurement is shorter? 6 kilometers or 5,500 meters?

The area of a rectangle is 7 2/5 square feet the length of this rectangle is 3 1/12 feet what is the width

Lilah's band had practiced 24 songs. at a performance, they played 7 songs in their first set and 8 in their second set. how many songs did they have for their third set, if they had to save one song for an encore?

One integer is 5 more than another. Their product is 104. Find the integers

Multiply (9x10^5) x (9x10^7)

a bag of wax contains 160oz of content. it takes 8oz of wax to make one of wax to make one homemade candles. what fraction of the bag do you use to make one candle?

Mr. frick wanted to buy one folder for each of his 104 students each box contained 25 folders estimate the number of boxes he needed to buy

A rectangular restaurant kitchen has a perimeter of 34 meters and an area of 70 square meters. What are the dimensions of the kitchen?

Abby's weight has triped since her first birthday. if w represents the amount abby weighed on her first birthday, write an expression to show how much abby weighs now

Nevaeh mowed 2 lawns in 4 hours. What was her rate of mowing in lawns per hour?