6)A right triangle rule: if 2 legs are equal, the hypotenuse is the length of that leg*
9) Pythagorean Theorem
We know the hypotenuse (41) so we substitute that for c and 9 for b now we need to find a
which gives us 40
10) same with #6 but we do the opposite. SInce we have the hypotenuse, we can divide that by because we know that if 2 legs are equal, the hypotenuse is multiplied by . Multiply the numerator and denominator by because we can't have a square root in the denominator.
11) like #9 we have the a and b but we need to find c
Probability that the first card is not a club is 1 minus probability that it is a club. i.e. 1 - 1/4 = 3/4 Probability that the second card is a diamond = 1/4 Probability that the first card is not a club AND the second card is a diamond is 3/4 x 1/4 = 3/16