Abag contains 7 red marbles, 3 blue marbles, 1 green what is the prob. of choosing a marble not blue?

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Either enter an exact answer in terms of \piπ or use 3.143.14 for \piπ and enter your answer as a decimal.