Timely Transport provides local delivery service for a number of downtown and suburban businesses. Delivery charges are based on distance and weight involved for each delivery: 23 cents per pound and 18 cents per mile. Also, there is a $28 handling fee per parcel. a. Develop an expression that summarizes delivery charges. (Enter your answers as dollar amounts to 2 decimal places. (x1= weight, x2= distance)) b. Determine the delivery charge for transporting a 38-pound parcel 18 miles. (Do not round your intermediate calculation. Round your answer to 2 decimal places.)