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Anna11 [10]
3 years ago
6

Two small pitchers and one large pitcher can hold 8 cups of water. One large pitcher minus one small pitcher constitutes 2 cups

of water. How many cups of water can each pitcher hold? Set up system of equations and solve
Mathematics
1 answer:
Olegator [25]3 years ago
6 0
Let the capacity of the large pitcher be L cups and the capacity of the small pitcher be S cups.1) L+2S = 8 "Two small pitchers (2S) and one large pitcher (L) can hold 8 cups of water."2) L-S = 2 "One large pitcher (L) minus one small pitcher (S) constitute 2 cups of water."Solve equation 2) for L---> (L = S+2) and substitue into equation 1) to get:1a) (S+2)+2S = 8 Solve for S.
1b) 3S+2 = 8 Subtract 2 from both sides.1c) 3S = 6 Divide both sides by 3.1d) S = 2 andL = S+2L = 2+2 = 4The large pitcher can hold 4 cups.The small pitcher can hold 2 cups.
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A spring has natural length 20 cm. Compare the work W1 done in stretching the spring from 20 cm to 30 cm with the work W2 done i
Ksju [112]

Answer:

W₂ is three times W₁ (W₂ = 3W₁)

Step-by-step explanation:

Applying,

W = ke²/2............. Equation 1

Where W = workdone in stretching the spring, k = spring constant, e = extension.

For W₁,

W₁ = ke₁²/2

Given: e₁ = 30-20 = 10 cm = 0.1 m

Substitute these value into equation 1

W₁ = k(0.1²)/2

W₁ = 0.005k Joules

For W₂,

W₂ = (ke/2)-W₁

Given: e = (40-20) = 20 cm = 0.1 m

Substitute these value into equation 1

W₂ = (k×0.2²/2)-0.005

W₂ = 0.015k Joules.

W₂/W₁ = 0.015k/0.005k

W₂/W₁ = 3

Therefore,

W₂ = 3W₁

3 0
3 years ago
Uh i got put into algebra 1 pls help
Tanzania [10]

Answer:

it's okay I did too and I understand nothing

8 0
3 years ago
Read 2 more answers
Mr. Voelz estimates that he will spend $10 on concessions at the basketball game. He actually spends $15. What is the percent er
irina [24]

Answer:

I am not sure but if you divide those 2 numbers such as dividing 10 by 15 you will get 0.666666666667 but if you round it you will have 67%

Step-by-step explanation:

Plz mark Brainliest

5 0
3 years ago
in a study of speed​ dating, male subjects were asked to rate the attractiveness of their female​ dates, and a sample of the res
Rudik [331]

Answer:

7-1.796\frac{2.216}{\sqrt{12}}=5.851    

7+1.796\frac{2.216}{\sqrt{12}}=8.149    

So on this case the 90% confidence interval would be given by (5.851;8.149)    

Step-by-step explanation:

Previous concepts

A confidence interval is "a range of values that’s likely to include a population value with a certain degree of confidence. It is often expressed a % whereby a population means lies between an upper and lower interval".

The margin of error is the range of values below and above the sample statistic in a confidence interval.

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

\bar X represent the sample mean for the sample  

\mu population mean (variable of interest)

s represent the sample standard deviation

n represent the sample size  

Solution to the problem

The confidence interval for the mean is given by the following formula:

\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}   (1)

Data: 7 8 2 10 6 5 7 8 8 9 5 9

In order to calculate the mean and the sample deviation we can use the following formulas:  

\bar X= \sum_{i=1}^n \frac{x_i}{n} (2)  

s=\sqrt{\frac{\sum_{i=1}^n (x_i-\bar X)}{n-1}} (3)  

The mean calculated for this case is \bar X=7

The sample deviation calculated s=2.216

In order to calculate the critical value t_{\alpha/2} we need to find first the degrees of freedom, given by:

df=n-1=12-1=11

Since the Confidence is 0.90 or 90%, the value of \alpha=0.1 and \alpha/2 =0.05, and we can use excel, a calculator or a table to find the critical value. The excel command would be: "=-T.INV(0.05,11)".And we see that t_{\alpha/2}=1.796

Now we have everything in order to replace into formula (1):

7-1.796\frac{2.216}{\sqrt{12}}=5.851    

7+1.796\frac{2.216}{\sqrt{12}}=8.149    

So on this case the 90% confidence interval would be given by (5.851;8.149)    

3 0
3 years ago
50 POINTS!! find area
just olya [345]

Answer: 29in^2

Step-by-step explanation:

The figure is formed by a square, a parallelogram and a rectangle.

Then, the area of the figure will be the sum of the area of the square, the area of the parallelogram and the area of the rectangle.

The area of the square is:

Area_1=side^2=(2in)^2=4in^2

The area of the parallelogram is:

Area_2=base*height=(5in)(3in)=15in^2

The area of the rectangle is:

Area_3=length*width=(5in)(2in)=10in^2

Therefore, the area of the figure is:

Area_T=A_1+A_2+A_3\\Area_T=4in^2+15in^2+10in^2\\Area_T=29in^2

6 0
3 years ago
Read 2 more answers
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