How do i turn the variable into a number?

A(t)=728(1+0.04)^t how much money did aditya originally invest

Find dy/dx using implicit differentiation ln(20+e^xy)=y

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no