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3 years ago

8

How many different ways can a chairperson and an assistant chairperson be selected for a research project if there are 7 scienti

sts available? Which counting method do you use?

1 answer:

alukav5142 [94]3 years ago

3 0

7P2, so 42 ways - permutation method since the order of choosing matters (chair and vice chair)

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Tommy wished he practiced more before his violin concert. If he had practiced 1 1/2 more hours one week, he would have averaged

Nimfa-mama [501]

Answer:

30.5 hours

Step-by-step explanation:

If he were to average 8 hours PER week for 4 weeks, his total sum would have been:

8 * 4 = 32 hours

But he fell short of it. By how much?

By $1\frac{1}{2}$ hours!

So, he practiced 1 1/2 hours LESS THAN 32 hours, so his practice time is:

$32-1\frac{1}{2}\\=32-1.5\\=30.5\\=30\frac{1}{2}$

So, <u>he practiced 30.5 hours in the 4 weeks</u>

8 0

4 years ago

A pea seller had some peas. He sold 40% of his stock and still had 420 peas. Originally, he had how many peas?

Zielflug [23.3K]

100-40= 60%

60% = 0.60

420/0.60 = 700

he had 700 peas

3 0

3 years ago

Read 2 more answers

Cylinder a has a height of 8 cm cylinder b has a height of 12 find the surface area

Olegator [25]

Answer:

You can't answer the question. It is missing essential information. What is the radius of the circle at the end of the cylinder.

Step-by-step explanation:

have a good day

5 0

3 years ago

ellen had 25 hair clips,7 of them were blue and the rest are purple.what percent of hair clips were purple

strojnjashka [21]

Answer=72%

25-7=18purple clips

18 x
____=____
25 100

cross multiply
25x=1800
divide both sides by 25
x=72%

6 0

3 years ago

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Solve the inequality. <br><br>The solution is....

MAVERICK [17]

Answer:

Step-by-step explanation:

-x - 6 > 21 - 28x

27x - 6 > 21

27x > 27

x > 1

8 0

4 years ago