Jamie purchased a dvd that was on sale for 15% off. the sales tax in her county is 5%. let y represent the original price of the dvd. write an expression that can be used to determine the final cost of the dvd.
a. y − 0.15y
b. 0.05(0.85y)
c. y − 0.85y + 0.05y
d. 1.05(0.85y)

Mr and mrs smith buy tickets for themselves and their four children. the cost of an adult ticket is ? 6 more than the adult ticket. the total cost of the six tickets is ? 40.50 work out the cost of an adult ticket. in your working let c be the cost of the child ticket and a be the cost of the adult ticket.

Is the figure congruent? yes or no?

The wheels of a bicycle have a diameter of 70cm. how many meters will the bicycle travel if each wheel makes 50 revolutions