Please help me solve these questions

Question 1 Sam has $100. He intends to invest $30 in Asset A and $70 in Asset B Not yet saved Marked out of 0.50 Flag question Given the following information about these assets: The annual return on Asset A is a random variable with expected value 7% p.a. and standard deviation 14%. The annual return on Asset B is a random variable with expected value 10% p.a. and standard deviation 20%. Assuming that these two assets have independent returns, what is the expected value of Sam's wealth at the end of the year? Please enter your answer rounded to the nearest cent, but with no dollar sign or commas. S. Answer: Question 2 Not yet saved Marked out of 1.00 Referring to the previous question: Assuming that the returns on these two assets are independent, what is the standard deviation of Sam's wealth at the end of the year? Please enter your answer rounded to the nearest cent, but without any dollar signs or commas. P Flag question Answer: Question 3 Not yet saved Marked out of 0.50 Assuming that the returns on Asset A and Asset B are both Normally distributed, what is the probability that Sam's wealth at the end of the year will be less than $100 (ignore the impact of rounding returns to the nearest cent). Please enter your answer accurate to 5 decimal places. Flag question Question 4 Not yet saved Marked out of 0.50 Assuming that the returns on Asset A and Asset B are both Normally distributed, what is the probability that Sam's wealth at the end of the year will be more than than $120 (ignore the impact of rounding returns to the nearest cent). Please enter your answer accurate to 5 decimal places. P Flag question Answer: Question 5 Suppose that Sam is very risk averse, and he would like to minimise the variance of his wealth at the end Not yet saved of the year. Marked out of 1.00 P Flag question He will invest $x in Asset A and $100-x in Asset B. What is the value of x which will minimise his variance? Please round your answer to the nearest cent, but do not include dollar signs or commas in your