The ratio of the radii of two circles is 9: 16. then what is the ratio of their circumferences?

Which shows the correct substitution of the values a, b and c from the equation 1=-2x+3x^2+1

Ineed to know the answer to this algebra question.

Asix-sided die of unknown bias is rolled 20 times, and the number 3 comes up 6 times. in the next three rounds (the die is rolled 20 times in each round), the number 3 comes up 6 times, 5 times, and 7 times. the experimental probability of rolling a 3 is 10 %, which is approximately % more than its theoretical probability. (round off your answers to the nearest integer.)