Can somebody do this rq, factor by grouping???

3x^2+5x-3

Using elimination, what is -4x+2y=-12 4x+8y=-24

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

The perimeter of an equilateral triangle is 4 cm more than the perimeter of a square and the length of a side of the triangle is 8 cm more than the length of a side of the aware. find the length of a side of the equilateral triangle