In a 30-60-90 triangle, how many sides do you need to know in order to determine the remaining sides?

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Idont understand math at all! : o( use this scenario to answer the remaining questions: brenton purchased a new bedroom set for $4,500.00. he lives in arizona and pays a 8.75% sales tax. if he made a 50% down payment and financed the rest, what amount did he finance? what is the total sales tax brenton will pay? enter your answer in currency format, round to the nearest cent. what was brenton's total amount financed? enter your answer in currency format, round to the nearest cent.

Use composition to determine if (x) or h(x) is the inverse of f(x) for the limited domain x2-1.