Does (7,2) make the inequality 2x+2y<20 true? I need this in 2 hours, so if you can tell me how to solve it as well please?

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

How do i i solve this equation? -18 = x/3 + 3

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.)