Answer:
There are 6 stores that have more that 38 pairs of glasses
Step-by-step explanation:
There are 6 stores that have more that 38 pairs of glasses
41,42,43,43,45,47
After the 3rd pick we have: 4 white, 3 red and 8 black marbles.
The probability that the 4th marble is black is:
P ( Black ) = 8 / 15 = 0.5333
After the 4th pick we have: 4 white, 3 red and 7 black marbles.
P ( Red or Black ) = 10 / 14 = 5 / 7 = 0.7143
You would use the Pythagorean there on which is a^2+b^2=c^2, from there you plug int what they gave you and solve for b, and b=12
4a - 3b
4(5) - 3(- 2)
20 + 6
26
26 is your answer.
