An unknown radioactive element decays into non-radioactive substances. In 760 days the radioactivity of a sample decreases by 61 percent. (a) What is the half-life of the element? half-life: (days) (b) How long will it take for a sample of 100 mg to decay to 56 mg? time needed: (days)

Q: rest

A:

Q: 3 %3D

A:

Q: dt VR-2t + 26

A:

Q: -0.50 1.00 а) 0.60 -100 -0.50 b) 0.60 100 -1.00 -0.50 1.00 c) 0.60 -1.00 -0.50 1.00 d) 60 -1.00

A:

Q: Number 27

A:

Q: Find  div(40, 7)=?

A: Let's find.

Q: Help with #2 pls

A:

Q: Number 15

A:

Q: Number 19

A: Solve value for x

Q: (E) se(a-30)d6

A: (k) Given that                                                           I=∫sec2(7-3θ)dθ