The cоst (in dоllаrs) оf а trip thаt is L miles long, driving a car that gets m miles per gallon, with gas costs of $p per gallon is C(L, m, p) = Lpm (in dollars){"version":"1.1","math":"C(L, m, p) = Lpm (in dollars)"}. Suppose L=1500 miles, m=32 mi/gal, p=$3.80 /gal{"version":"1.1","math":"L=1500 miles, m=32 mi/gal, p=$3.80 /gal"}. (a) Find the linear approximation of C about the point (1500, 32, 3.8). (b) Use the linear approximation to estimate the total cost of the trip if L changes to 1520 miles, m changes to 31 mi/gal, and p changes to $3.82 /gal. _______