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3 years ago

11

9. Based on the patterns observed in Exercises 5–8, describe a general formula that can be used to find the number of permutatio

ns of n things taken ???? at a time, or nPr

1 answer:

evablogger [386]3 years ago

6 0

Answer: a.(n-1)(n-2)...(n-r+1)

Step-by-step explanation:

a permutation of things taken at a time can be found using the formula.

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2. The sum of the measures of angle X and angle Y is 90. If the measure of angle X is 30 less than (1 point)

Mariulka [41]

Answer: angle y is 50°

Step-by-step explanation:

t + 2t - 30 = 90

3t -30 = 90

3t = 90+30

t = 120/3 = 40 = angle X

Angle y = 2t-30

y = 2*40-30

=80-30 = 50

8 0

3 years ago

Sarah bought pencils and markers for school. She bought 3 times as many pencils as markers.

Serhud [2]

Answer:

Sarah bought 30 pencils

Step-by-step explanation:

1. Let define p, as the number of pencils bought, and m, as the number of markers bought.

2.

$0.15p+0.30m=7.50$

$p=3m$

3. Substitute p in the first equation to 3m since p=3m as defined.

$0.15(3m) + 0.30m=7.50\\0.45m+0.30m=7.50\\0.75m=7.50\\m=10$

plug m into equation p=3m to find the number of pencils bought

$p=3m=3(10)=30$

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3 years ago

Order the numbers in each list from least to greatest. <br>0,|-14|, 13, -12, |-16|,17

Mrac [35]

Answer:

-12, 0, 13, [-14], [-16], 17

Step-by-step explanation:

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4 years ago

Of the following numbers, which one is prime: 14, 13, 21, 33?

Dvinal [7]

13 is a prime number because you can't multiply 2 numbers to make 13

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4 years ago

Find the distance between Point A (-7,3) and point B (-4,3) , correct to 2 decimal places. Use distance formula

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I hope this is the right answer.

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