Use the digits 1 3 4 and 7 to create two whole numbers whose product is estimated to be about 600

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup

Will mark ! (10 points also! ) if x varies inversely with y and x =6 when equals y= 10, find y when x=8 a. y=4.8 b. y=7.5 c. y=40/3 d. y=4/15

What is the length of side s of the square shown below?