The number of sides is the same as the number of lines of symmetry and the order of rotational symmetry.

So, a regular decagon would have 10 lines of symmetry.

6 0

3 years ago

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PLEASE HELP ME FIND THE ANSWER

n200080 [17]

B is true.
I think E is also true.

4 0

3 years ago

Solve with quadratic formula. 4k^2- 20 = k

zvonat [6]

Answer: $k= \frac{1+\sqrt{321} }{8} , \frac{1-\sqrt{321} }{8}$

Step-by-step explanation:

Move all terms to one side.

$4^{2} -20-k=0$

Use the Quadratic Formula.

$k=\frac{1+\sqrt{321} }{8}$ , $k=\frac{1-\sqrt{321} }{8}$

5 0

3 years ago

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The sound level of a jet plane is approximately 140 dB. The intensity of the sound of a jet plane is approximately

Leya [2.2K]

Answer:

280 DB

Step-by-step explanation:

8 0

2 years ago

The present value of an annuity of 3000 for 15 years at 4.5 % per annum CI is​

The present value of an annuity of 3000 for 15 years at 4.5 % per annum CI is