Ireally need someone to explain to me how to solve these types of equations. my teacher has been out a lot and i've been completely lost!

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?

"which statement is necessarily true if bd is an altitude to the hypotenuse of right ? abc? a.) ? adb? ? bdc b.) ? adb~? bdc c.) abbc=acbd d.) ? bac? ? bdc"