8,000,000 rounded to nearest million

What number should be added to the expression x^2+3x+ in order to create a perfect square trinomial? 3/2 3 9/4 9

How do you create a data set with 8 points in it that has a mean of approximately 10 and a standard deviation of approximately 1?

1.two more than the quotient of a number and 6 is equal to 7 use the c for the unknown number translate the sentence into an equation