If the simple interest on $3000 for 7 years is 840$, then what is the interest rate?

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?

How to do a maths question? i have a mock

Solve this problem by using a 5d process or writing and solving an equation. no matter which method you use, be sure to define your variable and write an equation to represent the relationship a rectangle has a perimeter of 30 inches. its length is one less than three times its width what are the length and wodyh of the rectangle?