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Alex73 [517]
3 years ago
10

1. If 3x + 4y =0 and x= 2y -5 , find the value of (X,y). 2. The sine of an angle is the ratio of the opposite to the? 3. Calcula

te the volume of a cylindrical steel bar which is 8cm long and 1.75cm in radius. (Take ) pi 22/7 Please help.
Mathematics
1 answer:
ddd [48]3 years ago
8 0

Answer:

1.

3x + 4y = 0

x - 2y = 5

Solving them simultaneously we get

x = 2 and y = -1.5

Value of (x , y ) is ( 2 , -1.5)

2. Sine of an angle is the ratio of the opposite to the Hypotenuse

3.

Volume of a cylinder = πr²h

r = radius h = height

V = 22/7 × 1.75² × 8

V = 22/7× 24.5

V = 77cm³

Volume of the cylinder is 77cm³

Hope this helps.

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Formula for area of triangle;

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Where 'B' represents the base, 'H' represents the height, and 1/2 is just dividing the product of those two lengths by 2.

Plug in what you know, given that the base of one triangle is 4, and the height is 6.

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A = 12, the area of <em>one triangle is 12 inches</em>.

Now, we find the area of all the triangles by multiplying the area of one triangle by 4.

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or

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A = 4^2 ← (The symbol ' ^ ' means raised to the power of.)

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