During an average life span, the human heart will beat about 2,800,000,000 times. write this number in scientific notation..

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

The track team ran a mile and a quarter during their practice how many kilometers did her team runs?

Question 6(multiple choice worth 5 points) (05.02 lc) what is the value of x? a right angle is shown divided into two parts. the measure of one part of the right angle is 10 degrees. the measure of the other part is 2x 20 40 45 85