If you simplify the following expression how many terms will you have? 3xy + 5x+ 2xy -5k please help!

What is the number 321,000,000 in scientific notation? also what is the number? ?

On ryan's last social studies test there were two types of questions true/false worth 3 points each and multiple choice questions worth 4 points each

Urgent? will give brainliest given that the blue triangle is a right triangle, which expression correctly gives the area of the red square? a) a2 + b2 b) a2 - b2 c) a2 - c2 d) c2 - a2