One square megameter is equal to 1.0×10^6 square kilometers. how many square megameters are in 4,000,000 square kilometers?

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

The administrator of a large assisted living facility wanted to know the average age of the residents living at the facility. he randomly selected 12 residents and determined their age, listed here: 80, 65, 75, 83, 68, 73, 88, 79, 94, 72, 79, 68 what's the average age of the sample of residents? a. 79 years old b. 68 years old c. 75 years old d. 77 years old

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?