A measure of for a numerical data set summarizes all of its values with a single number A) symmetry B)shape C) deviation D)center. NEED ASAP

Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

Explain step-by-step how to simplify -5(2x – 3y + 6z – 10).

What is the distance between the points (2, 5) and (5,9)?