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3 years ago

14

Submit in half an hour please

1 answer:

Crank3 years ago

5 0

I can not answer this without knowing what topic, and what you guys were reading and what the questions are based off om

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there are 30 students in mister Hollands music class is 30% of the students play in the school band how many students in the cla

Serjik [45]

30x0.3=9

9 students play in the school band.

(0.3 is 30% in decimal form)

7 0

4 years ago

3. C(8, r) = 28; r =

jeka94

Given:

$C(8,r)=28$

To find:

The value of r.

Solution:

Combination formula:

$C(n,r)=\dfrac{n!}{r!(n-r)!}$

We have,

$C(8,r)=28$

Using the combination formula, we get

$\dfrac{8!}{r!(8-r)!}=28$

$\dfrac{8!}{28}=r!(8-r)!$

$\dfrac{8\times 7\times 6!}{28}=r!(8-r)!$

$2\times 6!=r!(8-r)!$

It can be written as:

$2!6!=r!(8-r)!$ $[\because 2!=2\times 1=2]$

Case 1:

$2!=r!$

$r=2$

And,

$6!=(8-r)!$

$6=8-r$

$r=8-6$

$r=2$

Case 2:

$6!=r!$

$r=6$

And,

$2!=(8-r)!$

$2=8-r$

$r=8-2$

$r=6$

Therefore, the value of r is either 2 or 6.

8 0

3 years ago

Please help me solve this

d1i1m1o1n [39]

Answer:

(1,2) i think

Step-by-step explanation:

if it doesn't help then i'll screw myself over

3 0

3 years ago

Read 2 more answers

A billing company that collects bills for doctors' offices in the area is concerned that the percentage of bills being paid by

lukranit [14]

Answer:

Following are the responses to the given question:

Step-by-step explanation:

$H_o : p =0.31\\\\H_a: p \neq 0.31\\\\n = 8606 \\\\ p^ = 0.32$

$TS = \frac{(p^ - p)}{\sqrt{(\frac{pq}{n})}}$

$= \frac{(0.32-0.31)}{\sqrt{(\frac{0.31\times 0.69}{8368})}}\\\\=\frac{0.01}{5.4}\\\\=0.00185\\\\$

3 0

3 years ago

Amy purchased a prepaid phone card for $20 Long distance calls cost $.22 a minute using this card Amy use her card only wants to

kogti [31]

Answer:

24

Step-by-step explanation:

$20 - $14.72 = $5.28

$5.28 ÷ $0.22=24

5 0

3 years ago