Solve each of the following literal equations for c: (c/b) - x = 2d and ac + bd = x

How long must $542 be invested at a rate of 7% to earn $303.52 in interest? in a easier way

Erin bought christmas cards for $2 each to send to her family and friends. which variable is the dependent variable?

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.