Answer:
0.045
Hope this helpful! Have a great night/day!
Answer:

Step-by-step explanation:

Their combined chance of winning is 20%.
It takes 45 seconds. the easiest way to do these is to use a graphic calculator and replace the variables with x and y, for example, this equation would become -5x^2+30x, and if you don't have access to a graphing calculator, you can always use desmos online.
A = (1/2)bh [b = 10 m, h = 6 m]
A = (1/2) * 10 * 6 = 30 m²