I think I know what approach to take for part c and d but I keep getting the answer wrong. for part c I solve for R and instead of having v in the equation I replace it with C. And for part D, using the numbers given, you just solve for R. Is this the correct approach? please help.

1 -T 21-r. 1+al-x 1 - (c) The escape velocity of an object with mass M and radius R is given by 2GM Vesc A black hole is an astrophysical compact object formed after the death of a massive star and nothing can escape from inside. This means the escape velocity at its "surface" is the speed of light c. Find the radius RBH of a black hole with mass M in terms of c. G and M. (d) The supermassive black hole sitting at the center of our Milky Way galaxy has a mass M - 4.2 x 105 Mo where 1Mo - 2.0 x 1030kg is the solar mass. Estimate RBH in solar radius Ro - 7.0 x 105km for this black hole using e - 3.0 x 105 m/s. msi