Answer:
https://pre-ap.collegeboard.org/about/pre-ap-and-springboard
Explanation:
Answer: supplied air mask
Explanation: because air can go in the mask and the gases and fumes can hurt you.
number of different pairs the teacher can choose= nCr (18+14, 2)=496
no. of opposite gender pairs possible= 14 (since there are only 14 boys)
probability = 14/496= 7/248
Find out all of the combos of sums (2,3,5,9,3,4,6,10,4,5,7,11,5,6,8,12)
Then find out how many of these are divisible by 3 (6)
Count how many possibilities there are (24)
6/24=25%
Speed or velocity
