The half-life of hellum 5 is 76 x 1022 seconds, and the half-life of hellum 9 15 7 x 1021 seconds. Approximately how many times greater is the half-life of hellum-9 than that of hellum-5?
A.2 times
B.7 times
C.9 times
D.11 times

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Consider a cube that has sides of length l. now consider putting the largest sphere you can inside this cube without any point on the sphere lying outside of the cube. the volume ratio -volume of the sphere/ volume of the cube is 1. 5.2 × 10−1 2. 3.8 × 10−1 3. 1.9 4. 2.5 × 10−1 5. 3.8

Ntriangle abc, m∠a = 35° and m∠b = 40°, and a=9. which equation should you solve to find b?