Which pair of triangles must be similar?
a) triangles 1 and 2 each have a 35° angle.
b) triangles 3 and 4 are both isosceles. they each have a 40° angle.
c) triangle 5 has a 30° angle and a 90° angle. triangle 6 has a 30° angle and a 70° angle.
d) triangle 7 has a 50° angle and a 25° angle. triangle 8 has a 50° angle and a 105° angle.

The marriott family bought a new apartment three years ago for $65,000. the apartment is now worth $86,515. assuming a steady rate of growth, what was the yearly rate of appreciation? what is the percent of the yearly rate of appreciation?

How to find the exponential function y=ca^x, with points (1,2) and (2,1)

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.