1. bob tried to answer the following question by finding the missing angle and rounding the answer to the nearest degree.
(see photo)
here is his solution
cosx =16/20
x=cos-1 (16/20) = 36.8698976 = 37degree
bob made a mistake in his work. explain the mistake and write the correct solution.

2) the following picture is a square pyramid where ae=6/2 cm and angle eab =45degrees.
find the surface area of the pyramid. (make sure you include formulas and numbers in the formulas as part of your solution. also include units in your final answer.)

Iwant to know what 3g+5h+4g-2h is my teacher is too selfish to tell us

What is the value of m in the equation 1/2 m - 3/4n=16 when n=8

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?