Jessica wants to take three books on vacation with her. She has five books to choose from. How many possible combinations of thr ee books could she take on vacation?
2 answers:
Answer:
We use the combination formula:
combinations = n! / r! * (n-r)!
n = 5 and r =3
combinations = 5! / 3! * 2!
combinations = 5! / 12
combinations = 5 * 4 * 3 * 2 * 1 / 12
combinations = 5 * 2 = 10
Step-by-step explanation:
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Answer: A.4
Step-by-step explanation:
Step 1
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Step 2
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Isolate x in 2nd equation... -x - 2y = -10 ....add 2y to both sides -x = 2y - 10 ...multiply by -1 to make x positive x = -2y + 10 <== u would sub in -2y + 10 in for x in the 1st equation
Only a guess but 69.5 7 9