Worth 5 points pls answer both questions
what is the difference between simple intrest and annual intrest ?

mrs. sing invests $12,876 for her business at an annual interest rate of 7 percent for 3 years. which number will mrs. sing substitute for r in the simple interest formula?
l=prt < formula

0.007
0.07
0.7
7

The number of revolutions of two pulleys is inversely proportional to their diameters. if a 24-inch diameter pulley making 400 revolutions per minute is belted to an 8-inch diameter pulley, find the number of revolutions per minute of the smaller pulley.

Kayla and alberto are selling fruit for a school fundraiser. customers can buy small boxes of grapefruit and large boxes of grapefruit. kayla sold 3 small boxes of grapefruit and 1 large box of grapefruit for a total of $65. alberto sold 1 small box of grapefruit and 1 large box of grapefruit for a total of $55. what is the cost each of one small box of grapefruit and one large box of grapefruit?

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?