Which property is this?

9a + (-9a) = 0

Set up an algebraic equation and solve the problem. the ratio of male students to female students at a certain university is 5 to 7. if there is a total of 12,600 students, find the number of male students and the number of female students.

Kim states, "If the diagonals of a parallelogram form right angles, then the parallelogram is a rectangle." Decide if her statement is true or false. A. True B. False

Justin packed two suitcases for his trip and compared the weights of the items he packed in each of the suitcases. A number line goes from 0 to 36. Suitcase 1's whiskers range from 4 to 30, and the box ranges from 8 to 12.

Which graph represents the function of f (x) = the quantity of 9 x squared minus 36, all over 3 x plus 6?

The radius of the circle is 12. What is the circumference of the circle

To use the two sample t procedure to perform a significance test on the difference of two means, we assume: a) The populations' standard deviation are known. b) The samples from each population are independent. c) The sample sizes are large.

The USA won 15 Wimbledon championships. Sweden and Switzerland both won 7. Australia won 6, German won 4, and Spain won 2. Write the Ratio that compares the championships won by Australia to the total number of championships. Explain it's meaning.

How many solution does x^2=4x-5 have

Leonard used 2/7 of his paycheck

Write two numbers that are multilied together to get to 75 but are added together to get 10?