Suppose the exchange rate of USD1 is equivalent to RM 3.90. Ahmad goes to the money changer to change RM200 to US Pollars at this rate. This money change gives Ahmad back change of RM5 together with the US Dollars. How much US Dollars does Ahmad receive?

Could someone with number 1 and 2

See attachment below and find the equivalent of tan(∠qsr)

At the beginning of year 1, carlos invests $600 at an annual compound interest rate of 4%. he makes no deposits to or withdrawals from the account. which explicit formula can be used to find the account's balance at the beginning of year 5? what is, the balance?