Simplify 247+13 all the work please

[15 points]find the least common multiple of the expressions: 1. 3x^2, 6x - 18 2. 5x, 5x(x +2) 3. x^2 - 9, x + 3 4. x^2 - 3x - 10, x + 2 explain if possible

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.

Car a and car b were in a race .the driver of car b claimed that his car was twice as fast as car a