7/6-1/3 as a single fraction with a denominator of 6

Natasha spent 1 1/2 hours on the beach. she fell asleep for 3/4 of the time she was on the beach and then woke up with a terrible sunburn. how many hours was natasha asleep on the beach?

Given the function f(x) = log base 4(x+8) , find the value of f^-1(2)

Find the domain and range of the following function f(x) = 51x - 21+ 4