1.

In an extensive study- of cost functions for 40' firms in ISreat Britain, it was found that if 1' is the output [in millions of units] and y is the total cost {in thousands of pounds of sterling}, then the cost function is similar to the following: em) = {1.11%2 + 2.49: + 13.25 Compute the marginal costs when a: = 52 million units have been produced. The marginal costs at 52 million units is {Enter a number only, including a negative sign, if appropriate.) The proper units are: OThousands of pounds of sterling per million units 0 Units per sterling O Millions of units per thousands of pounds of sterling O Sterling per unit The time it takes an average athlete to swim i meters freester at age I can be modeled as at} 2 UJSIEE 3.4633 + 1413'\"! seconds. A} Find the instantaneous rate of change of the time for a 28-year-old swimmer to swim 1130' meters E] Find the average rate of change of the time for a 28-year-old to 29-year-old swimmer tD swim 1