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guajiro [1.7K]
3 years ago
11

Prove: If a^2-a is even then a is even.

Mathematics
1 answer:
Alla [95]3 years ago
6 0

This is not always true. Consider a=3. Then 3^2-3=9-3=6 is even, but a is odd.

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Please help
Bumek [7]

Answer:

The answer is B,C, and D

Step-by-step explanation:

I GOT. THE. QUESTION. RIGHT. ON. EDUNUTITY

7 0
3 years ago
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For each of the described curves, decide if the curve would be more easily given by a polar equation or a Cartesian equation. Th
Reptile [31]

Answer:

  (a)  (x-2)^2 +(y-2)^2 = 16

  (b)  r = 2

Step-by-step explanation:

(a) When the circle is offset from the origin, the equation for the radius gets messy. In general, it will be the root of a quadratic equation in sine and cosine, not easily simplified. The Cartesian equation is easier to write.

  Circle centered at (h, k) with radius r:

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The given circle is ...

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(b) When the circle is centered at the origin, the radius is a constant. The desired circle is most easily written in polar coordinates:

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6 0
3 years ago
What is the value of x in the equation x – y = 30, when y = 15?
lord [1]

(2/3)(30)=20
30+20=50=(x/5)
(50*5)=x=250 

hope this helps

5 0
3 years ago
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In your pattern which shape covers more of the plane blue rhombus red trapezoid or green triangles? Explain how you know.
mixas84 [53]

Answer:

Which shapes cover more of the plane" means that we are comparing the areas covered by the different types of shapes. In these patterns, two triangles match up to one rhombus, and three triangles match up to one trapezoid.

In both Pattern A and Pattern B, the first hexagonal part is made up of 7 triangles, 4 rhombuses, and 3 trapezoids.

The first hexagonal part is repeated across the pattern, so whichever type of shape covers the most area of this first part also covers the most area in the whole pattern.

<em>hope it helps</em>

3 0
3 years ago
3/4 − 2/5 in a fraction
Dennis_Churaev [7]

Answer:

7/10

Step-by-step explanation:

6 0
3 years ago
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