Can someone me with the first two ratio tables? ?

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

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price

Find the combined area of the triangles. click on the answer until the correct answer is showing.possible answers: a = 4 pi - 8a = 9 pi - 9/2 √3a = 16/3 pia = 16a = 27 pi