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NeX [460]
3 years ago
11

Reflect the point (-20,4)

Mathematics
1 answer:
Firdavs [7]3 years ago
4 0
Refrection of (-20, 4) across x-axis gives (-20, 4) = (-20, -4)

Refrection of (-20, 4) across y-axis gives (20, 4)

Refrection of (-20, 4) across y = -x gives (20, -4)

Refrection of (-20, 4) across y = 7 gives (20, 10)
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Calculate the second moment of area of a 4-in-diameter shaft about the x-x and yy axes, as shown.
Keith_Richards [23]
Second moment of area about an axis along any diameter in the plane of the cross section (i.e. x-x, y-y) is each equal to (1/4)pi r^4.
The second moment of area about the zz-axis (along the axis of the cylinder) is the sum of the two, namely (1/2)pi r^4.

The derivation is by integration of the following:
int int y^2 dA
over the area of the cross section, and can be found in any book on mechanics of materials.

6 0
3 years ago
Derive a formula to find the perimeter of an isosceles triangle in which one of the equal
Scorpion4ik [409]

Given :

Length of one of the equal sides of an isosceles triangle = 3x+2

Then, length of the other equal side will also be = 3x+2

Length of the unequal side of this isosceles triangle = 14

Formula for finding the perimeter of an isosceles triangle :

= \tt  side + side + side

A formula for finding the perimeter of this isosceles triangle :

= \tt3x + 2 + 3x + 2 + 14

Bringing all like terms together we get :

=\tt 3x + 3x + 2 + 2 + 14

= \tt6x + 4 + 14

\color{plum}\tt  = 6x + 18

Thus, the formula = 6x+18

Therefore, a formula to find the perimeter of this isosceles triangle = <u>6x+18</u>

7 0
3 years ago
7.<br> If cos θ= 0.866, find θ, writing your answer to the nearest degree.
Bumek [7]

See attachment for reply and answer.

7 0
3 years ago
How many times bigger is 3.45×10⁹ than 0.5×10⁴
GenaCL600 [577]

To solve 3.45 x 10⁹, you have to move the decimal point of 3.45 nine times to the right(---->). Once you do that, you get 3450000000. To solve 0.5 x 10⁴, you have to move the decimal point of 0.5 four times to the right. That equals 5,000. Now the final question is: How many times bigger is 3450000000 than 5,000. So, you divide 3450000000 by 5,000. That equals 690000.

690,000 times bigger than 0.5 x 10⁴

4 0
3 years ago
Read 2 more answers
Mrs. stone is three times older than her younger daughter, Joyce, but only two times older than her older daughter, Alex. how ol
yarga [219]

Answer:

54

Step-by-step explanation:

RSM homework lol

made equation, then solved it.

hope this helps!

6 0
3 years ago
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