Find the missing length for each of the following (Round to the nearest tenth if necessary)

Apply distributive property to write equivalent equation 105×35m

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.)

What number should be added by both sides of the equation to complete the the square? x^2-10x=7