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harkovskaia [24]
3 years ago
13

Help plzzzz Which equation describes the statement shown?

Mathematics
2 answers:
Sedaia [141]3 years ago
8 0

Answer:

y=x-3

Step-by-step explanation

Elis [28]3 years ago
7 0
I don’t know this one sorry
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An instructor gives her class the choice to do 7 questions out of the 10 on an exam.
Maksim231197 [3]

Answer:

(a) 120 choices

(b) 110 choices

Step-by-step explanation:

The number of ways in which we can select k element from a group n elements is given by:

nCk=\frac{n!}{k!(n-k)!}

So, the number of ways in which a student can select the 7 questions from the 10 questions is calculated as:

10C7=\frac{10!}{7!(10-7)!}=120

Then each student have 120 possible choices.

On the other hand, if a student must answer at least 3 of the first 5 questions, we have the following cases:

1. A student select 3 questions from the first 5 questions and 4 questions from the last 5 questions. It means that the number of choices is given by:

(5C3)(5C4)=\frac{5!}{3!(5-3)!}*\frac{5!}{4!(5-4)!}=50

2. A student select 4 questions from the first 5 questions and 3 questions from the last 5 questions. It means that the number of choices is given by:

(5C4)(5C3)=\frac{5!}{4!(5-4)!}*\frac{5!}{3!(5-3)!}=50

3. A student select 5 questions from the first 5 questions and 2 questions from the last 5 questions. It means that the number of choices is given by:

(5C5)(5C2)=\frac{5!}{5!(5-5)!}*\frac{5!}{2!(5-2)!}=10

So, if a student must answer at least 3 of the first 5 questions, he/she have 110 choices. It is calculated as:

50 + 50 + 10 = 110

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3 years ago
Write a fraction equivalent to 4/18
marysya [2.9K]

Answer:

Its 2/9, sorry I can't show the explanation I have to do my work.

Step-by-step explanation:

6 0
3 years ago
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If you add 17 to an even number, the answer will be even.<br> OA. True<br> OB. False
Rama09 [41]

Answer:

the answer is false because it will always be a odd number

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1 year ago
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PLZ HELP ASAP DUE RN
matrenka [14]

Answer:

The first and third options are correct so choose both

Step-by-step explanation:

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2 years ago
PLEASE HELP ANSWER ASAP NO LINKS PLZ
schepotkina [342]

Answer:

Y = 4

Step-by-step explanation:

12 - 8 = 4  and if you put another triangle it will look like a complete square, so you will need to subtract it     Hope it Helps  

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2 years ago
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