9.) write the following phrase as an algebra
equation:
half the sumof a three-times a number and
seven is twenty-eight

Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

Given that abcd is a rhombus, what is the value of x?