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olchik [2.2K]
3 years ago
15

Pls pls help it's urgent!!!​

Mathematics
1 answer:
Serggg [28]3 years ago
3 0

Answer: number 6 is the correct one

Step-by-step

all of the facts stated on that question are true

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Write an equation for the line parallel to the line - 8x + 4y = 4 through the point (-6,3). Please enter your answer in slope in
Nutka1998 [239]

Answer:

y = 2x + 15     OR    2x- y +15 =0

Step-by-step explanation:

To find the equation for the line parallel to the line -8x + 4y = 4, passing through the point (-6,3), we will first make the equation given to be in slope-intercept form, so that we can find the slope of this line

-8x + 4y = 4 we have to change it to the form y=mx + c

To do that, lets add 8x to both-side of the equation

8x -8x +4y=8x+4

4y=8x+4

divide both-side of the equation by 4

4y/4  = 8x/4  +4/4

y=2x + 1

comparing the above equation with y=mx + c

our slope(m) = 2

Any equation parallel to this line will have the same slope, so the slope(m) of our new equation will also be 2

Now we need to find the intercept of our new equation, to do that we will plug in the points given and our new slope into y=mx + c and find the value of our intercept(c)

The points given are x=-6 and y=3 and our new slope is m=2

plugging in our variables, thus;

y =mx + c

3 = 2(-6) + c

3 = -12 + c

add 12 to both-side of the equation

3+12 = -12+12+c

15=c

c=15

Therefore our intercept for the new equation is 15

To form our new equation, we will just plug in our new slope and intercept into y=mx + c

y = 2x + 15    (this is in slope intercept form)

we can rearrange it to be in standard form;

2x- y-15=0

5 0
4 years ago
Optimization Calculus Problem
frosja888 [35]
\bf \begin{cases}
V_c=\textit{cylinder's volume}\\
V_h=\textit{hemisphere's volume}\\
A_c=\textit{area of the cylinder}\\
A_h=\textit{area of the hemisphere}
\end{cases}
\\\\\\
V_c+V_h=6000\implies (\pi r^2h)+\left( \frac{2\pi r^3}{3} \right)
\\\\\\
6000=\cfrac{3\pi r^2h+2\pi r^3}{3}\implies 18000-2\pi r^3=3\pi r^2h
\\\\\\
\boxed{\cfrac{6000}{\pi r^2}-\cfrac{2r}{3}=h}
\\\\
-------------------------------\\\\



\bf A_c=2\pi rh+2\pi r^2\implies A_c=2\pi r\left(\cfrac{6000}{\pi r^2}-\cfrac{2r}{3}  \right)+2\pi r^2
\\\\\\
A_c=\cfrac{12000}{r}-\cfrac{4\pi r^2}{3}\impliedby \textit{say it has a cost of 1, so stays the same}\\\\
-------------------------------\\\\
A_h=2\pi r^2\impliedby \textit{has a cost of 8 times the cylinder's}
\\\\\\
A_h=16\pi r^2\\\\
-------------------------------\\\\


\bf \textit{total cost is }A_c+A_h
\\\\\\
\cfrac{12000}{r}-\cfrac{4\pi r^2}{3}+16\pi r^2\implies \cfrac{12000}{r}-\cfrac{4\pi r^2}{3}+\cfrac{48\pi r^2}{3}
\\\\\\
\boxed{C(r)=\cfrac{12000}{r}+\cfrac{44\pi r^2}{3}}
7 0
3 years ago
This figure is 1/4 of a circle.
Leno4ka [110]

Answer:

3.1in

Step-by-step explanation:

Radius: r=2in

Perimeter of circle: p=2×pi×r=4×pi

Perimeter of figure: p1=p/4=pi=3.14in

Best approximation: 3.1in

7 0
3 years ago
Read 2 more answers
Choose the equation of the line that has a slope of zero and passes through the point (6, -3).
olga2289 [7]

Answer:

y= -3

Step-by-step explanation:

Since there is no slope, there is no mx in y=mx+b. Because the line has to go through point (6,-3), the y-intercept is -3.

7 0
3 years ago
A car can travel 300 miles on 10 gallons of gas. The ratio is 300 miles to 10 gallons.Write the ratio given in the problem. Divi
grin007 [14]

Answer:

The new ratio is 30 miles : 1 gallon it called the unit rate          

Step-by-step explanation:

* <em>Lets explain what is the unit rate</em>

- A unit rate describes how many units of the first type of quantity

 equal to one unit of the second type of quantity

- Ex: 3 miles per hour

       $100 per day

       15 students per class

- A unit rate is a rate with 1 in the denominator

- Ex: $20 for 5 pens, the rate is 20 : 5 divide the two terms by the

 denominator 5, then 20 : 5 = 4 : 1 then unit rate is $4 per pen

* <em>Lets solve the problem</em>

- A car can travel 300 miles on 10 gallons of gas

∴ The rate is 300 miles per 10 gallons

- To find the unit rate divide the two terms of the rate by 10

∴ 300 : 10 = 300/10 : 10/10

∴ 300 : 10 = 30 : 1

∴ <u><em>The unit rate is 30 miles per gallon</em></u>

* The new ratio is 30 miles : 1 gallon it called the unit rate          

8 0
4 years ago
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