A principal of $4700 is invested at 8.25% interest compounded annually. How much will the investment be worth after 7 years?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4

Astudent must have an average on five test that is greater than it equal to 80% but less than 90% to receive a final grade of b. devon's greades on the first four test were 78% 62% 91% and 80% what range if grades on the fifth test would give him a b in the course? ( assuming the highest grade is 100%)