Can someone please answer this question with work?

Acylinder has volume 45π and radius 3. what is it’s height?

What is the value of x in the equation 2(x-4) = 4(2x + 1)?

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.)