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**Help ASAP plz!!!**

Can someone plz show me how to do the 2 problems below? I really don't know how...Thanks

1)The number of new cars purchased in a city can be modeled by the equation C=22t^2+17tt+9933, where C is the number of new cars and t=0 corresponds to the number of new cars purchased in 1976. In what year will the number of new cars reach 38,000?

2)During the years 1992-1996, the average number of green grapes, G, sold by a large farmer's market can be modeled by

G= -11t^2+2.02t+41.09. The average number of red grapes, R, sold by the farmer's market can be modeled by R= .004t^2-.688t+79.06. Determine the model representing the number of grapes, N, sold from 1992-1996.