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elena-s [515]
3 years ago
15

If Jackie were to paint her living room alone it would take five hours. Her sister Violet could do the job in six hours. How lon

g would it take them working together?
Mathematics
1 answer:
yuradex [85]3 years ago
6 0
Find how much work they get done in 1 hour
jackie takes 5 hours to do 1 room, so in 1 hour, she does 1/5 room
voilet take 6 hours to do 1 room so in 1 hour, she does 1/6 room

together, they do 1/5+1/6 room in 1 hour
make common denom
1/5+1/6=6/30+5/30=11/30 in 1 hour
11/30 times time=1 room
times both sides by 30/11
time=30/11 hour
time=2 and 8/11 hour
that is about 2 hours and 44 mins


2 and 8/11 hour or 30/11 hours
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Select all of the following statements that are true:
Maurinko [17]

Answer:

B. You shouldnt take a random sample of more than 5% of the population size.

Step-by-step explanation:

B. You shouldnt take a random sample of more than 5% of the population size. This is True, so as to avoid the research analysis to be more complex to interpret and analyzed

However, the following are not true statements:

A. Random samples only generate unbiased estimates of long-run proportions, not long-run means. This is False, as there may be sampling error, when picking the sample, which will lead to bias estimates in the long run proportions

C. There is no way that a random sample of 100 people can be representative of all adults living in the United States. This is False, as using the right factors such as gender, age, income, etc, in selecting the sample, 100 people is enough to use as sample of adults living in the United States

D. If this question is voted out, the alternate option is "larger samples are always better than smaller samples, regardless of how the sample was collected." This is False, larger samples are not always better than smaller samples. In fact, they are often difficult to analyze and interpret.

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8 0
3 years ago
Fractions, Decimals<br>Write each as a decimal<br>1) 90%​
andrey2020 [161]

Answer:

0.9

Step-by-step explanation:

90%

=90/100

=9/10

=0.9

4 0
3 years ago
The side length of a cube is 5√ cm.<br><br> Which answer is a rational value?
alisha [4.7K]
Is it a multiple-choice question? If so, we'll need the options before we can assist you. Until then...

Xo,
Coug
7 0
3 years ago
In ΔABC, BC = 4 centimeters, m∠B = m∠C, and m∠A = 20°. What is AC to two decimal places?
ipn [44]
M<A = <span>20°
m<B = m<C = 8</span><span>0°

</span>Law of Sines , in any triangle we have
a/sin A = b/sin B = c/sin c<span>

4/sin20 = AC/sin80 = AB/sin80

now we can solve AC

</span>4/sin20 = AC/sin80
<span>AC = 4 (sin80)/ sin20
AC = 4(0.98) / (0.34)
AC = 3.92 / 0.34
AC = 11.52

answer

</span>C.11.52 centimeters<span>

</span>
5 0
3 years ago
Read 2 more answers
I don’t understand please help?
Lerok [7]

Answer:

D

Step-by-step explanation:

Cuz sqr root of 20 = 2 sqrt 5, -2 sqrt 5

7 0
3 years ago
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