please help me understand these cash flow diagrams and solve the 2 questions asked

For the diagram, 40 30 20 10 i = 10% A = ? Question 1 find the unknown quantity (Round your answer to six decimal places.) number (rtol=0.01, atol=1e-08) > The following cash flow shows the deposits and withdrawals in a bank account. Determine the final amount in the bank account given an interest rate of 3%. 40 30 + 20 20 10 15 15 15 F-2 number (rtol=0.01, atol=1e-08)