Use mental math to solve the problem.

Mario sold his old skateboard for $45. If he buys a

new skateboard for double the price that he sold

his old one, how much did he pay for his new

skateboard?

What would x and y be in this equation 4x - 5y = 7

How are 0.02 and 20 related? 20 is 1 tenth of 0.02. 20 is 1,000 times 0.02. 0.02 is 10 times 20. 0.02 is 1 hundredth of 20.

At the begging of the month a store had a balance of - 554

What the answer for 0+4t=7t+15

Jolie brought balls of green and blue color thirty five percent of ball are blue if she brought total of 300 balls how many green balls she had

The length of a rectangular wall is 16.5 feet. The height of the wall is 8.625 feet. Cameron determines the area of the wall to be 1423.125 square feet. Which best explains the reasonableness of Cameron's solution?

Find the rate of change for the solution you run 7 miles in one hour and 14 miles in two hours

Express 12,312,087 in words

Ian finds 9$ for each hour he works and 10$ for each day he works. To find out how much he makes in a day, he made the equation y=9x+10x, where x is the number of hours he works.

N 2008, the Queen Sesheshet Pyramid was discovered in Egypt. Archeologists determined that the original height of this right square pyramid was about 14 m and the original base side length was about 22 m.