Find x^3- 2y^2- 3x^3+ z^4 if x = 3, y = 5, and z = -3 the upward arrows means that it is squared, cubed, etc hurry

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

What is the sum of these mixed numbers 4 2/3+ 3 1/9