Factor the expression. 36y2 – 84y – 147

(2y + 7)(6y – 7)

3(2y + 7)(6y + 7)

3(2y – 7)(6y + 7)

(2y – 7)(18y + 21)

1) 3 (6y+7) (2y−7)

2) 12y2+28y−49

3) 36y2+168y+147

4) 36y2−84y−147

5) 3(6y+7)(2y−7)

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can someone me: the midsegment through the legs of an isosceles triangle is 4 in. find the sides of the triangle if its perimeter is 20 in. ,   and point g is the centroid of the right △abc with hypotenuse ab=18 in. find cg.