Wy do both ways of writing a number as ten and ones describe the same number

Im taking a math test at 30 mins and Ima fail psh. i dont understand any of it.

Jimmy had 8 boxes with 3 cars in each box. if jimmy wanted to give each of his 4 friends an equal number of cars, how many cars would each friend get?

Simplify: √27 A. 3√3 B. 9√3 C. 3√9 D. 5√3

5 a Write down the two prime numbers that are factors of 28.

0.75 degrees centigrade is this a positive or negative temperature?

While buying paint at the store Aglacia decided to determine how many cubic inches of paint she would get. She measured the diameter of Sherwin Williams Brand paint can at diameter 11 inches and the height at 9 inches.

Alan deposits $4000 into an account that pays simple interest at a rate of 5% per year. How much interest will he be paid in the first 5 years?

Bryan cut two peaches. he cut one into sixths and one into fourths. bryan ate 5sixths of the first peach and his brother ate 3fourths of the second peach. who ate more

What happens when the smog lifts in Los Angeles

1. Caroline drove 350 miles to the beach. The trip took her 57 hours. What was her average speed in miles per hour?