Decide whether perimeter or area would be used to find the quantity of flower seeds needed for a field

20 da is equal to a. 2,000 cm. b. 2 m. c. 20,000 cm. d. 20,000 mm

Find the solution of this system of equation -7x+y=-20 9x-3y=36

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents