could use help with these please

\fA building was bought for $100,000 and sold 18 years later for $460,000. What interest rate (compounded continuously) was earned on the investment? To find the interest rate earned on this investment, use the formula for continuous compound interest, where A is the final amount, P is the initial amount, r is the interest rate, and t is the time period. What is the formula for continuous compound interest?Determine if the function f(x) is continuous and/or differentiable at x = 1? x+1 for - 1 = x = 1 f(x) = 2x for 1