A*b*sin(c) / 2
8*21*sin(68)=77.88 or rounded 77.9
First, find the total inflation over the past 37 years: 37 years * 3.7%/year = 136.9 %. Then just multiply the original cost by the inflation and add the original cost so: ($20,000 * 1.369) + $20,000 = $47,380.
H=-t^2+95
The y intercept here is 95, and it represented from where the boy threw the ball.
If he threw it from 95 ft above the ground, the best answer for where he is is on a bridge.
His backyard is at 0 ft (sea level). An underground cave is below sea level. A ladder is probably not 95 ft.
Final answer: D