Answer:
i got stuck on this after solving the triangle. Below shows where I ended.
Step-by-step explanation:
1/2 * 12 * 25=150
I think is 12??? because area is l×w
The equation to calculate how many ways that "r" things can be chosen from a larger set of "n" things is:n! / [r! * (n-r)!] =
12! / (5! * 7!) =
12 * 11 * 10 * 9 * 8 * 7! / (5! * 7!) =12 * 11 * 10 * 9 * 8 / 5 * 4 * 3 * 2 =11 * 9 * 8 =792 ways
http://www.1728.org/combinat.htm
The answer is -3. I just did it on a calculator
