At the beginning of 1990, oil prices were $30 a barrel. Some oil investors predicted that the price of oil would increase by $5 a barrel per year. In the beginning of 2005, the price of oil was $20 a barrel. With increasing demand for oil around the world, oil investors in 2005 predicted that the price of oil would increase by $2.25 a barrel each year.

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

step-by-step explanation:

hihi so drawing these 2 triangles is fairly simple. all that's left is finding the height of each one. luckily, we have a side length and an angle, so there is a trig function we can use to solve for the height. the easiest one to use would be tangent, since we have 2/3 things needed to find and the third needed is what we are solving for. tan(73°) * 30 ~= 98.13 and tan(73°) * 35 ~= 114.45