Hello, I need help with these practice questions pleasee . Could you do them on a piece of paper or on the practice questions sheets so I can better understand.

Thank you

l. A radioactive substance decays so that after t years, the amount remaining, expressed as apercem of the original amount, is A(t) = 100(1.2)"t. a) What is the half-life for this substance? Round to 2 decimal places. b) Determine the rate of decay after 5 years. Round to 2 decimal places. 2. The value of an investment in Canada Savings Bonds is compounded continuously at 3.75% per annum. At what rate, correct to 2 decimal places, is the investment growing at the time when its value has doubled? \