I need help with a problem ​

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.

Toyland is having a sale. all items are 20% off. how much will you save on an item that usually sells for 95$ explain your

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36