Reference no: EM133084142

1. A retirement account is opened with an initial deposit of $8,500 and earns 8.12% interest compounded monthly. What will the account be worth in 20 years? What if the deposit was calculated using simple interest? Could you see the situation in a graph? From what point one is better than the other?

2. Graph the function f(x)=5(o.5)-x and its reflection about the line y=x on the same axis, and give the x-intercept of the reflection. Prove that ax =exlna.. [Suggestion: type y = 5(0.5-x) {- 7 < x < 2} {0 < y < 7} in desmos, and then type its inverse function.]

3. How long will it take before twenty percent of our 1,000-gram sample of uranium-235 has decayed?

The decay equation is A(t) = AoeKt , where t is the time for the decay, and K is the characteristic of the material. Suppose T is the time it takes for half of the unstable material in a sample of a radioactive substance to decay, called its half-life. Prove that. What is K for the uranium-235?