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guapka [62]
2 years ago
8

What is the estimate of 1374 x 6

Mathematics
1 answer:
timama [110]2 years ago
7 0
Hey it is 1374 x6 8244

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Aileen can read 1.5 pages for every page her friend can read. Aileen's mom was very excited and she said to Aileen: "So, if your
dalvyx [7]

No, Aileen's mom is incorrect. Aileen can read 30 pages in the same time period as her friend reads 20 pages.

To get this answer, you multiply 20 by 1.5

20 x 1.5 = 30

8 0
2 years ago
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Find, correct to four decimal places, the length of the curve of intersection of the cylinder 16x2 + y2 = 16 and the plane x + y
Yuri [45]

Let the curve C be the intersection of the cylinder  



16x^2+y^2=16



and the plane



x+y+z=1



The projection of C on to the x-y plane is the ellipse



16x^2+y^2=16



To see clearly that this is an ellipse, le us divide through by 16, to get



\frac{x^2}{1}+ \frac{y^2}{16}=1



or  



\frac{x^2}{1^2}+ \frac{y^2}{4^2}=1,



We can write the following parametric equations,



x=cos(t), y=4sin(t)



for  



0\le t \le 2\pi



Since C lies on the plane,



x+y+z=1



it must satisfy its equation.



Let us make z the subject first,  



z=1-x-y



This implies that,



z=1-sin(t)-4cos(t)



We can now write the vector equation of C, to obtain,



r(t)=(cos(t),4sin(t),1-cos(t)-4sin(t))



The length of the curve of the intersection of the cylinder and the plane is now given by,



\int\limits^{2\pi}_0 {|r'(t)|} \, dt



But  



r'(t)=(-sin(t),4cos(t),sin(t)-4cos(t))



|r'(t)|=\sqrt{(-sin(t))^2+(4cos(t))^2+(sin(t)-4cos(t))}



\int\limits^{2\pi}_0 {\sqrt{2sin^2(t)+32cos(t)-8sin(t)cos(t)} }\, dt=24.08778184



Therefore the length of the curve of the intersection  intersection of the cylinder and the plane is 24.0878 units correct to four decimal places.

6 0
2 years ago
4x + 9y =-14 please hurry and answer
MrRa [10]

Answer:

Step-by-step explanation:

4x+9y=-14

make x 0

9y=-14

y=-1.5(repeating)

to figure out x make y zero.

4x=-14

x=-3.5

hope this helped!

4 0
2 years ago
What does x and y equal to 2x-3y=-7 2x+y=13
Vinvika [58]

Answer: x=4,y=5

Step-by-step explanation:

7 0
2 years ago
If the temperature in Minneapolis was -20℉ and then dropped to -25℉, what was the change in temperature?
Natali5045456 [20]

Answer:

B, 5 degrees

Step-by-step explanation:

-20 -5 = -25

8 0
2 years ago
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