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kodGreya [7K]
3 years ago
5

Does anyone one how to solve this problem

Mathematics
1 answer:
aliya0001 [1]3 years ago
5 0
( \frac{2}{3} - \frac{1}{6} )÷( \frac{2}{5} - \frac{1}{3} )
The first thing you must do it to solve the fractions inside the parentheses first
\frac{2}{3} - \frac{1}{6} = \frac{4}{6} - \frac{1}{6} which is \frac{3}{6} or \frac{2}{3}because you must get a common denominator in order to solve. The common denominator is 6. So you must multiply in order to get 6. \frac{2}{3} *6= \frac{3}{6} Then you do the other fraction: \frac{2}{5} - \frac{1}{3}= \frac{6}{15}  - \frac{5}{15} which is \frac{1}{15} because 15 is the common denominator and you must multiply the denominator to get 15, thus, you must multiply by the same amount for the numerator. So now it is \frac{3}{6}÷\frac{1}{15} but when dividing, you just need to flip-flop the second fraction and then multiply across. Now it is \frac{3}{6} * \frac{15}{1} = \frac{45}{6} But to simplify, you find a common factor which is 3.
45÷3=15 and 6÷3=2 which is now \frac{15}{2}
You answer is C)\frac{15}{2}
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A local retailer claims that the mean waiting time is less than 8 minutes. A random sample of 20 waiting times has a mean of 6.3
rusak2 [61]

Answer:

The claim is not true

Step-by-step explanation:

We are given that A local retailer claims that the mean waiting time is less than 8 minutes.

H_0:\mu=8

H_a:\mu

A random sample of 20 waiting times has a mean of 6.3 minutes with a standard deviation of 2.1 minutes.

\bar{x}=6.3

s = 2.1

n = 20

Since n <30 and population standard deviation is unknown

So,we will use t test

So,t=\frac{x-\mu}{\frac{s}{\sqrt{n}}}

t=\frac{6.3-8}{\frac{2.1}{\sqrt{20}}}

t=-3.62

α = 0.01

Degree of freedom = df=n-1=20-1=19

t_{df,\frac{\alpha}{2}}=t_{19,\frac{0.01}{2}}=2.861

t calculated < t critical

So, we failed to reject null hypothesis

Hence the claim is not true

8 0
4 years ago
Evaluate the following: −3 − (−8).
AlekseyPX

Answer:

5

Step-by-step explanation:

When you have a negative next to a negative, you can turn it into a positive. For example the -(-8) would now be +8. This is called the airplane strategy because it forms a airplane if you flip you sheet of paper or your device.

From here, we have -3+8.

Now we subtract since each value has a different sign and we get +5.

Hope this helps!! :)

3 0
4 years ago
Read 2 more answers
Pizza Perfection sold 93 pieces on Monday 67 pizzas and Tuesday 78 pizzas on Wednesday 44 piece pizzas on Thursday and 123 pizza
Irina18 [472]
93+67+78+44+123/5= 81 the answer 
8 0
3 years ago
Suppose you have $20 to spend on party decorations. Balloons are $0.05 each, streamers are $0.25 each, and noisemakers are $0.40
sergejj [24]

[C] 0.05b + 0.25s + 0.4n = 20

b = balloons

s = streamers

n = noisemaker

Since they already give us the price of each item we just need to add a variable at the end of each one since we don't know how many of each item is bought. Adding the costs of all the party supplies should not go over $20. We can automatically eliminate B and D. We can also eliminate A because the prices of each item are incorrect. Therefore, C is the correct answer.

Best of Luck!

4 0
3 years ago
3y + 6y - 3x * 10m =
Angelina_Jolie [31]

Answer: 9y-30mx

Step-by-step explanation:

3y+6y=9y

9y-3\cdot \:10mx

3\cdot \:10=30

=9y-30mx

Please mark Brainliest

4 0
4 years ago
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