Atruck gets 500/x miles per gallon (mpg) when driven at a constant speed of x mph, where 40 ≤ x ≤ 80. if the price of fuel is $2.80/gal and the driver is paid $10/hr, at what speed is it most economical for the trucker to drive? (round your answer to two decimal places.)

The local electronics store is offering a promotion "1-year: same as cash," meaning that you can buy a tv now, and wait a year to pay (with no in

Show the changes to the t-accounts for the federal reserve and for commercial banks when the federal reserve buys $50 million in u.s. treasury bills. if the public holds a fixed amount of currency (so that all loans create an equal amount of deposits in the banking system), the minimum reserve ratio is 10%, and banks hold no excess reserves, by how much will deposits in the commercial banks change? by how much will the money supply change? show the final changes to the t-account for commercial banks when the money supply changes by this amount.

An insurance company estimates the probability of an earthquake in the next year to be 0.0015. the average damage done to a house by an earthquake it estimates to be $90,000. if the company offers earthquake insurance for $150, what is company`s expected value of the policy? hint: think, is it profitable for the insurance company or not? will they gain (positive expected value) or lose (negative expected value)? if the expected value is negative, remember to show "-" sign. no "+" sign needed for the positive expected value