Can two of the angles of an isoceles triangle measure 90° and 45°?

Find the sum of the first 8 terms of the following sequence. round to the nearest hundredth if necessary.

The perimeter of a rhombus with a side of 6 is 24

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