A scholarship fund raised $7,000 in contributions. Part of the contributions were invested in bonds paying 6% interest, and the rest were invested in
bank certificates paying 8.5% interest. If the total annual income is $520,
create a system to model the scenario. Then find the amount invested in the
8.5% account.

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.)