A planet has mass 6.4x1024 kg and radius 3.4x100 m. Calculate energy required to
remove on object of mass 800 kg from
the surface of the planet to infinity.

a_n = a_1 + (n - 1)d

the first term is 6.

the common difference d = ?

when you find d, replace n with 7 and d with the common difference to find your answer.

if 4 pounds of tomatoes cost $14 then make a t chart then divide 14 by 4