Which expression is equivalent to 15 y - 8 y ?
5 y+ 2 y
9 y - 3 y
Choose the correct answer below.
A.
The expression 9 y minus 3 y is equivalent to 15 y minus 8 y.
B.
Both expressions are equivalent to 15 y minus 8 y.
C.
Neither expression is equivalent to 15 y minus 8 y.
D.
The expression 5 y plus 2 y is equivalent to 15 y minus 8 y.

Amachine that produces a special type of transistor (a component of computers) has a 2% defective rate. the production is considered a random process where each transistor is independent of the others. (a) what is the probability that the 10th transistor produced is the first with a defect? (b) what is the probability that the machine produces no defective transistors in a batch of 100? (c) on average, how many transistors would you expect to be produced before the first with a defect? what is the standard deviation? (d) another machine that also produces transistors has a 5% defective rate where each transistor is produced independent of the others. on average how many transistors would you expect to be produced with this machine before the first with a defect? what is the standard deviation? (e) based on your answers to parts (c) and (d), how does increasing the probability of an event a↵ect the mean and standard deviation of the wait time until success?