Any one? can i please get help with these two problems

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Examine the two-step equation. − 7 4 + x 4 = 2 which property of operations allows you to add the same constant term to both sides? amultiplication property of equality bdivision property of equality caddition property of equality dsubtraction property of equality