Solve the Problem $\frac { d E } { d x } = 2 x + 7$

Solve the problem.
-A certain company has found that its expenditure rate per day (in hundreds of dollars) on a certain type of job is given by $\frac { d E } { d x } = 2 x + 7$ , where $x$ is the number of days since the start of the job. Find the expenditure if the job takes 3 days.

A) $30
B) $3000
C) $13
D) $1300