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3 years ago

Yall... help pls this is hard

Mathematics

1 answer:

madreJ [45]3 years ago

3 0

Answer:

First one Or Last. I think the last one though

Step-by-step explanation:

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Find the x- and y- intercepts of 2x -2y = -6

Sonbull [250]

2x-2y=-6

-2y= -2x-6

y=x+3

Y-intercept= 3

X-intercept= -3

8 0

4 years ago

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A fisherman traveled in a boat from point N upstream. After having traveled 6 km, he stopped rowing and 2 hour 40 min after firs

Nat2105 [25]

Answer:

The speed of the river's current is 4.5 km/hr.

Step-by-step explanation:

Given : A fisherman traveled in a boat from point N upstream.

After having traveled 6 km, he stopped rowing and 2 hour 40 min after first leaving N, he was brought back to N by the current.

Knowing that the speed of the boat in still water is 9 km/hour

To find : The speed of the river’s current.

Solution :

Let the speed of current = x km/h

Speed of boat = 9 km/h

Thus, the speed in upstream = (9 - x) km/h

Also, the speed in downstream = x km/h (because the boat is stationary in downstream)

Total distance = 6 km ( from N to the point he reached )

Total time = 2 hours 40 minutes

$\text{2 hours 40 minutes}=2\frac{40}{60}=2 \frac{2}{3} \\\\\text{2 hours 40 minutes}=\frac{8}{3} \text{ hours}$

We know, $\text{Time} = \frac{\text{Distance}}{\text{Speed}}$

According to the question,

$\frac{6}{9-x}+\frac{6}{x}=\frac{8}{3}$

Taking LCM and 6 common

$6[\frac{x+9-x}{(9-x)x}]=\frac{8}{3}$

Take 6 to another side,

$\frac{9}{9x-x^2}=\frac{8}{3\times 6}$

Cross multiply,

$9\times 18=8\times(9x-x^2)$

$162=72x-8x^2$

Taking 4 common and cancel out

$4x^2-36x+81=0$

Solve quadratic equation by middle term split,

$4x^2-18x-18x+81=0$

$2x(2x-9)-9(2x-9)=0$

$(2x-9)(2x-9)=0$

$\Rightarrow 2x-9=0$

$\Rightarrow x=\frac{9}{2}=4.5$

Therefore, The speed of the river's current is 4.5 km/hr.

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3 years ago

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lys-0071 [83]

$\large\boxed{\tt Answer:~2\pi ~or~around~6.283~units}$

$\tt Step-by-step~explanation:$

The equation for finding the circumference of a circle:

If the radius of this circle is 1, then that means the diameter is 2. We multiply 2 by π to get our answer: 2π or approximately 6.283.

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3 years ago

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Solve 1 + x - 15 =-2/2/3

german

Answer:

1 + x - 15 =-2/2/3

x-14=-2/2/3

x-14=-.33

x=14.33

Step-by-step explanation:

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3 years ago

A survey of favorite movie types found that 36% of people polled preferred comedies instead of action movies. if

Wittaler [7]

Answer:

Step-by-step explanation:

The answer is greater than 450 because the percentage is less than 100%

36% = 36/100 = 0.36

450/0.36 = 1250

how many people were surveyed?:

1250

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2 years ago