When was the earth formed?

I Am having a hard time find the fraction for 2.25. If you find the answer can you tell me how you got it.

What are the common factors of: 15, 20?

And equation that equals 23 that has a negative in it but the answer is positive

In a survey of 2,300 people who owned a certain type of car, 1,610 said they would buy that type of car again. What percent of the people surveyed were satisfied with the car?

Solve the inequality - x/2 <4

The area of a square can be tripled by increasing the length and width by 10 inches. What is the original length of the square?

Anna bought 8 tetras and 2 rainbow fish for her aquarium. The rainbow fish cost $6 more than the tetras. She paid a total of $37. Which of the following are true? Select all that apply. A.

Two commuters leave the same city at the same time but travel in opposite directions. One car is traveling at an average speed of 63 miles per hour, and the other car is traveling at an average speed of 59 miles per hour.

Simplify each expression: 5.) 4 4/5 + 3/4 * 2 1/4

4 over 8 (four eighths) times what equals 1?