I really need help with this

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

Suppose that a households monthly water bill (in dollars) is a linear function of the amount of water the household uses (in hundreds of cubic feet, hcf). when graphed, the function gives a line with slope of 1.65. if the monthly cost for 13 hcf is $46.10 what is the monthly cost for 19 hcf?

Prove that 16^4-2^13-4^5 is divisible by 11.