Which of the following is equivalent to 7a^4+3a^4

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?

Nine more than four times a number is the same as one less than twice the number. find the number?

The legs of a right triangle measure 6 meters and 8 meters. what is the length of the hypotonuse.