What is 2.1 * ten exponent nine in scientific notation?

You put money in two different accounts for one year each. The total simple interest for the two accounts is $140. You earn 6% interest on the first account, in which you deposited $1000. You deposited $800 in the second account.

Nick has to build a brick wall. Each row of the wall requires 6 squared bricks. There are ten rows in the wall. How many bricks will Nick require to build the wall?

What is the factored form of 8x^2 + 18x - 8

Amanda was 48 inches she grew n inches last year and is now 56 and 1/2 inches write an expression that represents the number of inches Amanda grew

To stay properly hydrated, a person should drink 32 ounces of water for every 60 minutes of exercise. How much water should Damon drink if he rides his bike for 135 minutes.

Solve the inequality. 4/5x+5<3

The amount of money in a bank account that is compounded yearly can be represented by the function A (y) =

20. Helen and Carla live in states that have different sales tax rates. They each bought a new bicycle. Helen paid $14 for a 5.6% sales tax on her bicycle. Carla paid $12 for a 4.8% sales tax on her bicycle.

Explain why 8,000: 800 = 10

Train A leaves the station every 9 minutes. TrainB leaves the station every 15 minutes. If it is 2:00 pm now and both left, when is the next time that both trains will leave together?