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- A company has found that its rate of expenditure (in hundreds of dollars) on a certain type of job is given by E′(x)=4x+5, where x is the number of days since the start of the job. Find the total expenditure if the job take 2 days.Find d2y dx2 in terms of x and y. x2y2 − 2x = 7 d2y dx2 =The value of d/dx(10 ·f(x) −5 ·g(x) + 7) at x= 2 is