Can someone show me exactly how to solve this equation? x-6> 7

Look at arnold's attempt to solve the equation for b: 3b = 12 b = 3 · 12 b = 36 describe the mistake that arnold made.

What is the radius of a circle with an area of 78.5 cubic inches? use 3.14 for pie

Timmy uses 1 1 2 cups of sugar for every 2 gallons of lemonade he makes. how many cups of sugar would timmy use if he makes 13 gallons of lemonade?