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ElenaW [278]
3 years ago
9

Which set is closed under subtraction?

Mathematics
1 answer:
siniylev [52]3 years ago
7 0
Third one is correct
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Masteriza [31]
The value of x should be 1 because since there's no number front of the x....so you always have to pretend that there's a invisible 1.
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How many cords of wood could you fit in a room that is 4 yards long, 4 yards wide, and 2 yards high?
Anuta_ua [19.1K]

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It depends on the dimensions of each cords of wood.  If each cord of wood is just one square yard large, then you could fit 4*4*2=32 cords of wood into a room that has the dimensions that you described.

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Clara goes minature golfing. She pays $7.50 admission and $6.25 for each round of she golfs. The total amount Clara pays includi
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Susie has 8 over 9cup of ice cream. How many 1 over 4cup servings can she make?
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6 0
4 years ago
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The radius of a right circular cone is increasing at a rate of 1.4 in/s while its height is decreasing at a rate of 2.1 in/s. At
kow [346]

Given:

\dfrac{dr}{dt}=1.4\text{ in/s}

\dfrac{dh}{dt}=-2.1\text{ in/s}

To find:

The rate of change in volume at r=120\text{ in. and }175\text{ in.}

Solution:

We know that, volume of a cone is

V=\dfrac{1}{3}\pi r^2h

Differentiate with respect to t.

\dfrac{dV}{dt}=\dfrac{1}{3}\pi\times \left[(r^2\dfrac{dh}{dt}) + h(2r\dfrac{dr}{dt})\right]

Substitute the given values.

\dfrac{dV}{dt}=\dfrac{1}{3}\times \dfrac{22}{7}\times \left[(120)^2(-2.1) +175(2)(120)(1.4)\right]

\dfrac{dV}{dt}=\dfrac{22}{21}\times \left[-30240+58800\right]

\dfrac{dV}{dt}=\dfrac{22}{21}\times 28560

\dfrac{dV}{dt}=29920

Therefore, the volume of decreased by 29920 cubic inches per second.

6 0
3 years ago
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