Math

I have my answers but need them checked and i probably got them wrong so if you can please explain.

#1: Which of the following sample spaces correctly lists all the possible outcomes for flipping a coin and spinning a four-colored spinner (red, blue, green, and yellow)?
(A) H-red, H-blue, H-green, H-yellow, T-yellow, T-green, T-blue, T-red
(B) H-red, T-red, H-blue, T-blue, H-green, T-yellow*****
(C) T-yellow, H-red, T-blue, H-green, T-green, H-yellow, T-red
(D) H-red, T-blue, H-green, T-yellow

#2:How many different lunch combinations can be made from two sandwich choices, three side item choices, and three beverage choices if you choose one sandwhich, one side, and one beverage?
(A) 8
(B) 9
(C) 18***
(D) 11

#3: Which of the following is a certain event?
(A) Rolling a composite number on a number cube
(B) Rolling a number greater than 1 on a number cube
(C) Rolling an odd or even number on a number cube*****
(D) Rolling an odd or even number greater than 7

#4: A class has 9 girls and 12 boys. What is the probability of a teacher randomly calling on a boy?
(A) 3/4***
(B) 4/7
(C) 3/7
(D) 4/3

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  1. #1
    you have 4 colours and 2 ways to flip a coin
    so there should be 8 possible outcomes.
    your choice has only 6 outcomes

    #2, correct
    #3, correct
    #4, no, there are 21 students, 12 of which are boys
    prob = 12/21 = 4/7
    you stated the ratio of girls : boys

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    posted by Reiny
  2. Thanks Reiny :) You helped me get up to an A in Mathematics :3 Thx -Warrior Cat Lover

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