Have no idea what the answer to this one is, could someone help me?

Tan198=asin164=? how to solve this? ?

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.