Which of the following can not be used on a matrix when solving a system of equations

If 80 is increased by 20%, what is the new amount?

Who is Mitt Romney for math I am in 4th grade

How many times can 71 go into 8?

If you earned a penny every 10 seconds of your life then how many dollars would you have after 65 years

One number is six times another number. Their difference is 35. What are the two numbers?

Dad mows the lawn. he mows a length of 156 meters in 856 seconds. at what speed was he moving

While the bears were out, Goldilocks ate all but 3/8 of Papa Bear's big green cake off his plate. Then she ate all but 3/8 of the smaller pink cake on Baby Bear's plate.

If there was a circle and i wanted to find out the area. what is the area of a circle with a radius of 5

A patroman gives a driver a speeding ticket if the driver's speed is greater than 15% over the posted speed limits. if the speed limit is 40 miles per hour. what is the highest speed that a driver can go without receiving a ticket?

A bee hummingbird has a mass of 1.8 grams. How many grams are 6 hummingbirds and a 4-gram nest