5x-18<-8 I need help step by step

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

4. jake needs to score in the top 10% in order to earn a physical fitness certificate. the class mean is 78 and the standard deviation is 5.5. what raw score does he need? z value for top 10% =1.282 how do i get the z value? what is the equation for this? raw score =mean+z*sd = 78+1.282*5.5 = 85.051

What number can each term of the equation be multiplied by to eliminate fractions before solving ? 6-3/4x+1/3=1/2x+5