I need help with c and d. Please and thank you.

Assignment 3 (UNIT II) Derivatives of Exponential Functions / 11 The value of a Guaranteed Investment Certificate (GIC) is given by the function A(t)= 700(1.07), where A is the value, in dollars, after t years. (3) a) How long will it take the GIC to double in value? (2) b) Determine the derivative of A with respect to t. c) How fast is the value of the GIC changing at the end of 15 years? (4 ) d) Determine the equation of the tangent to the curve A(t) = 700(1.07) att = 10 years