I'm a little confused on these concepts, would really appreciate if you can break down each question.

1. Suppose a US investor has $11500 to invest and can choose either a US investment paying 2.25% or a foreign investment paying 8%, where e is currently 17. What future e would leave the investor indifferent between investing at home or abroad?
2. Suppose a US investor has $11500 to invest and can choose either a US investment paying 2.25% or a foreign investment paying 8%, where e is currently 17. What future e would leave the investor indifferent between investing at home or abroad?
3. Assume an economy can be modeled with these equations: C = 140 + 0.76 Yd, I = 200, G = 56 - 0.053 Y, X = 260 M = 355 and T = 10 + 0.29Y. What is the multiplier on Investment (ie if I increases by 1, how much does Y increase)? Sign & 2 decimals please.
4. Suppose a US investor has $7300 to invest and can choose either a US investment paying 5.25% or a foreign investment paying 4%, where e is currently 1.2. What future e would leave the investor indifferent between investing at home or abroad?
5. Assume an economy can be modeled with these equations: C = 170 + 0.8 Yd, I = 200, G = 53 - 0.052 Y, X = 320 M = 375 and T = 10 + 0.3Y. What is the multiplier on Taxation (ie if T0 increases by 1, how much does Y increase)? Sign & 2 decimals please.
6. Assume an economy can be modeled with these equations: C = 280 + 0.75 Yd, I = 200, G = 107 - 0.047 Y, X = 300 M = 345 and T = -40 + 0.26Y. What is the new value of Y when Investment rises by 5? 2 decimals please.