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3 years ago

PLEASE HELP ME... I WILL GIVE BRAINLIEST TO CORRECT PERSON. ALSO THIS IS FOR EDGE

Mathematics

1 answer:

tatiyna3 years ago

3 0

Answer:

Step-by-step explanation:

The equation for the dotted line is y=(-1/2)x, so therefore y<(-1/2)x must be the area under the dotted line.

The equation for the solid line is y=2x+3, so therefore y≥2x+3 must be the area above the solid line.

The section that is both under the dotted line and above the solid line is C.

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Problem PageQuestion It takes an older pump twice as long to drain a certain pool as it does a newer pump. Working together, it

umka2103 [35]

Answer:

It will take 6 hours for the new pump to drain the pool.

Step-by-step explanation:

As the complete question is not given, the complete question is found online and is attached herewith

Let the rate of new pump is given as x=W/t_1

Let the rate of the old pump is given as y=W/t_2

it is given that the time t_2=2t_1

So by substituting the values of t_2 in the rate equation of y

y=W/2t_1

y=(W/t_1*2)=x/2

Also the total rate of both the pumps is given as W/t3 where t3 is given as 4 hours so the equation becomes

x+y=W/4

x+x/2=W/4

3x/2=W/4

As x=W/t_1

3W/2t_1=W/4

Now as W is same on both sides so

3/2t_1=1/4

12=2t_1

t_1=6 hours

So it will take 6 hours for the new pump to drain the pool.

7 0

4 years ago

How many times does 8 go into 18 in fractions

crimeas [40]

8 goes into 18 in fractions 2 times

7 0

4 years ago

Read 2 more answers

Determine whether y2=3x+1 is a function.

bazaltina [42]

Answer: it is not a function

Step-by-step explanation:

Given :

$y^{2}$ = 3x + 1

The first thing is to make y the subject of the formula, that means we will take the square root of both sides

y = $\sqrt{3x + 1}$

since y = $\sqrt{3x + 1}$ , the the value of y could be positive or negative.

For example , $\sqrt{4}$ = ± 2 , since -2 x -2 will also give + 4

For y = $\sqrt{3x + 1}$ to be a function , there must be a unique value for y for each value of x , but this is not the case as y could be positive or negative for a single value of x , so it is not a function.

4 0

3 years ago

SampleVarianceandStandardError: You encounter a deck of Martian playing cards.There are 87 cards in the deck. You cannot read Ma

docker41 [41]

Answer:

(a) The standard error of estimate of the fraction of blue cards in the deck is 0.145.

(b) The sample size required is 84.

Step-by-step explanation:

The proportion of blue cards is, p = 0.30.

The number of times the cards were shuffled is, n = 10.

(a)

The standard error for sample proportion is given by:

$SE_{p}=\sqrt{\frac{p(1-p)}{n}}$

Compute the value of standard error as follows:

$SE_{p}=\sqrt{\frac{p(1-p)}{n}}\\=\sqrt{\frac{0.30\times (1-0.30)}{10}}\\=\sqrt{0.021}\\=0.145$

Thus, the standard error of estimate of the fraction of blue cards in the deck is 0.145.

(b)

Now we need to reduce the standard error.

The standard error is inversely proportional to the sample size.

If the sample size is increased then the standard error will be decreased.

So we need to use a larger sample size.

Compute the value of n for standard error 0.05 and p = 0.30 as follows:

$SE_{p}=\sqrt{\frac{p(1-p)}{n}}\\0.05=\sqrt{\frac{0.30(1-0.30)}{n}}\\0.05^{2}=\frac{0.21}{n}\\n=84$

Thus, the sample size required is 84.

4 0

4 years ago

A variable needs to be eliminated to solve the system of equations below. Choose the correct first step.

irinina [24]

Black F 19. I HOOKUP ! $100 & less. Deposit required . I CAN VERIFY

7 0

3 years ago