2. evaluate the expression for a = –1 and b = 5. show your work.
5a – 7b + b2

Can you me find the missing length. i attached an image.

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

Suppose a laboratory has a 30 g sample of polonium-210. the half-life of polonium-210 is about 138 days how many half-lives of polonium-210 occur in 1104 days? how much polonium is in the sample 1104 days later? 9; 0.06 g 8; 0.12 g 8; 2,070 g