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Ulleksa [173]
3 years ago
10

Need urgent help in mathematics!! Will mark brainliest!!!!

Mathematics
2 answers:
Sonbull [250]3 years ago
7 0

Hello!

7P5 is read as "is read "the number of permutations of 7 different things taken 5 at a time".

This means that each arrangement represents a different arrangement of 5 things out of a group of 7 things.

To show this, it would be written as: nPr = \frac{n!}{(n-r)!}. In this case, n is equal to 7 and r is equal to 5.

7P5 = \frac{7!}{(7-5)!} (simplify the parentheses and simplify the factorial)

7P5 = \frac{7 * 6 * 5 * 4 * 3 * 2 * 1}{2 * 1} (simplify the fraction)

7P5 = 2520

Therefore, the answer is the third choice, 2520.

Nataly [62]3 years ago
3 0

₇P₅ is a permutation. you can find this setting in the statistics menu of your scientific calculator (i think).

If you don't have a scientific calculator, you can use the following formula:

nPr = \frac{n!}{(n - r)!}

₇P₅  = \frac{7!}{(7 - 5)!}

     = \frac{7}{2!}

     = \frac{7 * 6 * 5 * 4 * 3 * 2!}{2!}

     = 7 * 6 * 5 * 4 * 3

    = 2520

Answer: C

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20 POINTS! PLS HELP!
Arturiano [62]

First statement is correct. If Sasha reads her novel for 94 minutes, she meets the minimum reading requirement without reading any of the autobiography.

Given,

The rate of reading of a novel by Sasha = 0.8 pages per minute

The rate of reading of autobiography by Sasha = 0.5 pages per minute

The reading requirement of Sasha's English class = atleast 75 pages per week

The given equation: 0.8n + 0.5a ≥ 75

n is the number of minutes she reads the novel

a is the number of minutes she reads the autobiography

Now, let's check the statements:

Statement 1: If Sasha reads her novel for 94 minutes, she meets the minimum reading requirement without reading any of the autobiography.

That is,

0.8 × 94 + 0.5 × 0 ≥ 75

75.2 ≥ 75

This statement satisfies the equation.

Other 4 statement didn't satisfy the equation.

So, first statement is correct.

Learn more about rate of reading here:

brainly.com/question/4459849

#SPJ1

7 0
1 year ago
Read 2 more answers
Hannah paddled the canoe for 3 hours at 2.2 miles per hour. How far did she paddle?
Grace [21]
6.6. 2.2*3= 6.6 
i hope this makes since
7 0
3 years ago
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numerele a, b si c sunt direct proportionale cu 2, 3 si 5. Daca media aritmetica a celor trei numere este egala cu 100, determin
Fynjy0 [20]

Answer:

a = 60

b = 90

c = 150

Step-by-step explanation:

Numerele a, b și c sunt direct proporționale cu 2, 3 și 5.

Unde k este constantă de proporționalitate

a ∝ 2

a = 2k

b ∝ 3

b = 3k

c ∝ 5

c = 5k

Dacă media aritmetică a celor trei numere este egală cu 100, determinați numerele a, b și c

= 2k + 3k + 5k / 3 = 100

= 10k / 3 = 100

Cross Multiply

= 10k = 3 × 100

= 10k = 300

Împărțiți ambele părți la 10

k = 300/10

k = 30

Pentru numărul a

a = 2k

a = 2 × 30

a = 60

Pentru numărul b

b = 3k

b = 3 × 30

b = 90

Pentru numărul c

c = 5k

c = 5 × 30

c = 150

Prin urmare, a = 60, b = 90, c = 150

3 0
3 years ago
What is (-6, 2) reflected across the x axis then dilated by 1/2?
RUDIKE [14]
Make sure you go ahead and plot your point on the graph that you are using dilation means the graph got smaller then the original graph so starting from your original point your going to rotate it on the graph to your new point which is 1/2
3 0
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I need help plotting before 7:00.
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J: (4,0)

M:(-1,1)

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