I'm thinking you would have to add the probabilities that you choose a boy with you choose someone in the science club minus a boy in the science club. You can't count these people twice.
I'm getting 59%
(11+10-2)/32
That would be the SSS postulate.
Answer:

Step-by-step explanation:
Using foil method, Multiply the first term

Next, Multiply the Outer term in each parenthesis. (2x^2 and 7


Then, Multiply the Inner Terms (-3x,-4,7) in each parenthesis


Then multiply the last term (-4 and 7).

Combine it you have

which simplify to

Answer:
The answer to your question is b = 9.5
Step-by-step explanation:
Data
hypotenuse = 10
leg 1 = 3
Process
1.- To solve this problem use the Pythagorean theorem.
c² = a² + b²
c = hypotenuse = 10
a = 3
b = x
2.- Solve for b
b² = c² - a²
3.- Substitution
b² = 10² - 3²
4.- Simplification
b² = 100 - 9
b² = 91
5.- Result
b = 9.5