PLEASE HELP I DONT KNOW THE ANSWERS TO THOSE TWO QUESTIONS THIS IS TIMED!!!

What is the value of x in the following equation. -x ^3/2 = -27

Given: m zade = 60° and m2cdf = (3x + 15) prove: x = 15

The john nash mall used 17,4000 kilowatt hours in may, with a peak load of 92 kilowatts. the demand charge is $5.95 per kilowatt, and the energy charge is $0.08 per kilowatt hour. the fuel adjustment charge is $0.017 per kilowatt hour. what is the total electricity cost for may?