Me. i've been stuck all day! i need to factor 10x^2-19x-51

Hey free points ! people i have a few math questions on my profile consider looking at them i have to get done in 30 mins!

Match the scale and the actual area to the area of the corresponding scale drawing. scale: 1 inch to 4 feet actual area: 128 square feet scale: 1 inch to 7 feet actual area: 147 square feet scale: 1 inch to 8 feet actual area: 256 square feet scale: 1 inch to 5 feet actual area: 225 square feet area of scale drawing scale and actual area scale drawing area: 3 square inches arrowright scale drawing area: 8 square inches arrowright scale drawing area: 4 square inches arrowright scale drawing area: 9 square inches arrowright

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?