Sam solved a similar equation below. is sams solution correct? explain why or why not? 9x+1=7(3x-2) 9x+1=21x-14 -30x+1 =-14 -30x=-15 x=1/2

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.