Hello, can someone help me with this question, please?

The rate of depreciation of a building is given by D'(t) = 3000 (10 - t) dollars per year, 0 lessthanorequalto t lessthanorequalto 10 see the following figure. (a) Use the graph to find the total depreciation of the building over the first 5 years (t = 0 to t = 5). (b) Use the definite integral to find the total depreciation over the first 5 years