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jeka57 [31]
2 years ago
6

Given that 5 miles is 8 km, convert 17.8 miles to km.

Mathematics
1 answer:
Sav [38]2 years ago
7 0

Answer:

28km

Step-by-step explanation:

5miles = 8km

17.8miles = x

\frac{17.8}{5}  \times 8km

x = 28km

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Solve the system. x – 4y – z = 21 6x – 3y – z = –4 –x +2y –5z = 19 Answer: x =      , y =      , z =      
FrozenT [24]

Consider the given equations:

-x+2y-5z = 19  (Equation 1)

6x-3y-z= -4    (Equation 2)

x-4y-z=21        (Equation 3)

Adding equations 1 and 3, we get

-x+2y-5z+x-4y-z = 19+21

-2y-6z = 40

So, we get -y -3z = 20 (Equation 4)

Multiplying equation 3 by '6', we get

6x - 24y-6z = 126       (Equation 5)

Subtracting equation 5 from equation 2, we get

(6x-3y-z)-(6x - 24y-6z) = -4-126

6x-3y-z-6x + 24y+6z) = -4-126

21y+5z = -130     (Equation 6)

Multiplying equation 4 by '21' and adding it to equation 6, we get

-21y-63z+21y+5z = 420-130

-58z = 290

So, z = -5

Since, -y-3z = 20 -y+15=20 y=-5

So, y=-5

Now, x-4y-z=21 x-4(-5)-(-5)=21 x+20+5=21 x+25=21 x= -4

So, x = -4

Therefore, x = -4, y= -5 and z= -5 are the solutions to the given equations.

7 0
3 years ago
Find the volume of the solid by rotating the region bounded by y=x^3, y=8, and x=0 about the y axis.
dimulka [17.4K]

Answer:

Solution : Volume = 96/5π

Step-by-step explanation:

If we slice at an arbitrary height y, we get a circular disk with radius x, where x = y^(1/3). So the area of a cross section through y should be:

A(y) = πx^2 = π(y^(1/3))^2 = πy^(2/3)

And now since the solid lies between y = 0, and y = 8, it's volume should be:

V =  ∫⁸₀  A(y)dy (in other words ∫ A(y)dy on the interval [0 to 8])

=> π ∫⁸₀ y^(2/3)dy

=> π[3/5 * y^(5/3)]⁸₀

=> 3/5π(³√8)⁵

=> 3/5π2^5

=> 96/5π ✓

7 0
3 years ago
Select the figure that would be next in the pattern below.
marissa [1.9K]
A because the difference between them is 1 but started at 2 and every time u add an extra 1
6 0
2 years ago
Per
Levart [38]

Answer:

1. 5200+5200=10400

2. 10400-361=10039

Branlyist pls

8 0
3 years ago
3. What line forms when a plane and a cylinder intersect?
leonid [27]
The answer to this depends on the angle at which they intersect. If it intersects<span> the cylinder perpendicular to the axis then a circle is formed. </span><span>If the plane intersects the cylinder at an angle, it will form an ellipse. This will be true until the plan is parallel with the axis of the cylinder. At that point, the surface will become a rectangle.</span>
6 0
3 years ago
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