There are 91 threatened and endangered plant and animal species in Texas right and solve an equation to find the number of threatened or endangered animals if there are 28 threatened and endangered plants

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Two angles are complementary. the larger angle is 36 more than the smaller angle. what is the measure of the larger angle?