PRACTICE PROBLEMS: #1 Solve and graph the inequality:
X-15-5
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1. are the triangles similar and if so why? what is the value of x? show your work.

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)