Justin deposited $54.25 into his bank account after making a $30.00 withdrawl to pay for some school supplies. represent these situations as signed numbers
a. 45.25, 30.00
b. -45.25, -30.00
c. 45.25, -30.00
d. -45.25, 20.00

Acertain drug is made from only two ingredients: compound a and compound b. there are 3 millimeters of compound a used for every 4 millimeters of compound b. if a chemist wants to make 693 milliliters of the drug, how many milliliters of compound a are needed?