How many terms does the expression 3k - 9+5m² have?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

When you dilate a figure with a scale factor of 1/2, what will the dilated figure look like?                                                                                           a: the dilated figure will have side lengths that are half the length of the original side lengths.                                                                          b: the angles in the dilated figure will be half the measure of the original figure.                                                                                c: the dilated figure will have side lengths twice the length of the original.

What percent of $1.00 are a nickel and a dime?