a store is selling ribbon by the yard. Mike bought 8 yards of red ribbon. Each yard cost $3.50. Complete and solve the working equation that represents the amount, a , Mike paid for buying 8 yards of ribbon.
a/8 = _
a = _ dollars
a/8 = 3.50
a = 8 * 3.50
a = $<<8*3.50=28>>28
Therefore, Mike paid $28 for buying 8 yards of ribbon.