Measuring instruments may have different degrees of precision. instrument a is precise to 10^-2cm. instrument b is precise to 5×10^-2cm, and instrument c is precise to 8×10^3cm. order the instruments from most precise (least possible error) to least precise (greatest precise error).

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.

Write the equation of the circle centered at (10,-2) with radius 2.

Alocal hamburger shop sold a combined total of 601 hamburgers and cheeseburgers on friday. there were 51 more cheeseburgers sold than hamburgers. how many hamburgers were sold on friday? a local hamburger shop sold a combined total of hamburgers and cheeseburgers on friday. there were more cheeseburgers sold than hamburgers. how many hamburgers were sold on friday?