The option for A is under a root, in an exponent, in the denominator, raised to an integer power.For b it's should, or should not.

m A company has found that the marginal cost (in thousands of dollars) to produce x central air conditioning units is C'(x) = 30x 21 , where x is the number of units 5 x + e produced. (a) Find the cost function, given that the company incurs a fixed cost of $11,000 even if no units are built. 21 (b) The company will seek a new source of investment income if the cost is more than $17,000 to produce 5 units. Should they seek this new source? .. . . . om (a) What substitution should be used to determine the cost function? 121 Use the quantity as the substitution, u = , so that du = ( dx. om The cost function is C(x) = 121 pm (b) Therefore, the cost of producing 5 units is $ so the company seek a new source of investment income. (Round to the nearest dollar as needed.) 121 pm