How do you do mathematics

Simplify b (a + b) - a (a - b).

Find the slope of (-2,3) (3,3)

You estimate that a jar contains 68 marbles. The actual number of marbles is 60. find the percent error.

Which of the following is equal to 4 and 2/3 : by 3 and 1/2 A. 4 and 2/3 * 3 and 2/1 B. 14/3 * 2/7 C. 14/3 * 7/2 42/3 * 2/31

Ashira has $40. She buys 5 plants for $6.20 each. How much money does Ashira have left? A. $9.00 B. $9.80 C. $31.80 D. $33.00

The price of a game after a 25% discount was $207. what was the price before the discount

Amy leaves a rest stop at 2 PM traveling west, at 45 miles per hour. Sarah leaves 2 hours later, also traveling west, but at 55 miles per hour.

4) Bill knows that the volume of a rectangular prism is 400 cm'. The box is labeled with the length as 6.5 cm and the width as 1.5 cm. What is the approximate height of the box? How do I find the height of the box?

Which expression is equivalent to complex fraction 3/x-1-4/2-2/x-1

4x^2-16x-5 can be written in vertex form f (x) = a (x-h) ^2+k. What are the values of a, h, and k.