29. The fuel EfCiEle' F fer a particular ear is given by Frx) =4).me +1.6561 + 5.4 whemx is the speed of the ear in miles per 1|er (mph) and Fljx} is the corresponding fuel r.:l'r:iel1i;:r in miles per gam] (mpg). {21] What is the fuel efciency if the car's speed is 2121 mph? [In] What Speed Will yield the maximum fuel efciency? Show work. x+13 34 + 311 Salve: x+ l5 x1 36 = {l , Show work