Garvey's electronic store is having a storewide sale. for a television set with a regular price of x dollars, a 15 percent discount is equal to $30. which of the following equations could not be used to determine x?
0.15x=x-30
0.85x=x-30
x-0.15x=x-30
0.15x=30

Aclothing store has just advertised at a bargain price, that a customer tries on a t-shirt is 0.40. a new range of t-shirts. the probability if a customer tries a t-shirt, the probability that they will buy it is 0.70 while if a customer does not try on a t-shirt, the probability that they will buy it is 0.15. a customer has just bought a t-shirt. find the probability that the customer did not try on the t- shirt.