(3x^4)-(-3x^4) simplify this please

Myron put $5000 in a 2-year cd playing 3% interest, compounded monthly. after 2 years, he withrew all his money. what was the amount of the withdrawal?

Aclass consists of 55% boys and 45% girls. it is observed that 25% of the class are boys and scored an a on the test, and 35% of the class are girls and scored an a on the test. if a student is chosen at random and is found to be a girl, the probability that the student scored an ais

My math teacher told my class to "steal" a 6th grade fraction word problem from the internet, word problems? : -p requirements: only a 1 step word problem. needs to be complex.