In a recent year, the number of $1 bills in circulation in the u. s. was about 7 billion. if the number of $10 bills was 20% of the number of $1 bills, about how many $10 bills were in circulation?

The number of calories you burn depends on your weight. a 110-pound person burns 163 calories during 30 minutes of tennis. find the number of calories that a 190-pound person would burn during the same activity, assuming they burn calories at the same rate.

Find the percent error of the measurement 4 cm

Y= x – 6 x = –4 what is the solution to the system of equations? (–8, –4) (–4, –8) (–4, 4) (4, –4)