What does it mean when the null space is 0?

Sherry purchased a new backpack for her daughter. The backpack was on sale for 20% off the regular price. If Sherry paid $28.80 for the backpack without sales tax, what was the original price?

A bag contains 2 steel balls and 5 brass balls. The total weight is 13 pounds. If 2 steel balls are added and 2 brass balls are removed, the weight decreases to 12 pounds. How much does each kind of ball weigh?

A manufacturer is making a 1000 times as many balls as you need to sell in his school Nationwide write expression using exponents to show how many yards are in a benefactor would need

What is the algebraic expression of a number decreased by the sum of the number and one?

Davis used a drawing and a scale factor of 4 to design his triangular yard. The area of the yard is 400 ft. He wants to find the area of the scale drawing.

Karen works for 85 hours throughout a two-week period. She earns $1,891.25 throughout this period. How much does Karen earn for 8 hours of work?

What is 15.06 rounded to the nearest tenth? 15.0 15.1 15.6 16.1

Find the area of a triangle with a base of 50 feet and a height of 8 feet. 400 ft.^2 100 ft.^2 200 ft.^2 58 ft.^2

Measure of a verticle angle is 7x+182 and another angle is 9x+194 solve for x

What are the first six nonzero multiples 5