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Tom [10]
3 years ago
7

PLEASE HELP!!!! WILL GIVE BRAINLIEST!!!!!

Mathematics
1 answer:
Advocard [28]3 years ago
3 0
SinA = O/H

= 8<span>√3  / 16
=</span>√3 / 2

answer is B √3 / 2
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The regular nonagon has rotational symmetry of which angle measures? Check all that apply.
11111nata11111 [884]
Consider the center of the nonagon. If we join the center to all the vertices, the central angle of 360°, is divided into 9 equal angles, each with a measure of:

360°/9=40°

So to a nonagon rotated 40°, clockwise or counterclockwise, is indistinguishable from the original one. 

similarly if we rotate 80 ° c.wise or c.c.wise 

in general, a nonagon has a rotational symmetry of 40°n,

where n∈{...-3, -2, -1, 0, 1, 2, 3}...

where 40°n, for n negative, means we are rotating clockwise.


Answer: any angle which is a multiple of 40°

8 0
3 years ago
Read 2 more answers
PLEASE HELP ME!!!!!!!!!
Makovka662 [10]

Answer:

  (a)  (5, -3)

Step-by-step explanation:

The "substitution method" for solving a system of equations requires that you write an expression that can be substituted for a variable in one or more of the other equations in the system.

<h3>Expression to substitute</h3>

The given equations are ...

  • y = x -8
  • 2x +3y = 1

We notice the first equation gives an expression for y. This is exactly what we want to substitute for y in the second equation.

<h3>Substitution</h3>

When the expression (x-8) is substituted for y in the second equation, you get ...

  2x +3(x -8) = 1

This simplifies to ...

  5x -24 = 1

<h3>Solution</h3>

This 2-step equation can now be solved in the usual way:

  5x = 25 . . . . . . add 24 to isolate the variable term

  x = 25/5 = 5 . . . . . divide by the coefficient of x

Note that we now know what the correct answer choice is.

Using the expression for y, we find ...

  y = x -8 = 5 -8 = -3

The solution is (x, y) = (5, -3).

__

The attached graph confirms this solution.

6 0
1 year ago
Find the product. -2x(x2 - 3)
zalisa [80]

Step-by-step explanation:

-2x(x2 - 3)

-2x³+6x

Hope it helps ☺️

5 0
3 years ago
Jeanie sells M&amp;Ms out of her giant bag at 4 for 5 cents. The machine at the store sells you 9 for 25 cents. which is the bet
Blizzard [7]

Answer:

drip

Step-by-step explanation:

6 0
3 years ago
Darryl earns $10 per hour tutoring students after school. If Darryl tutored for 25 hours this month, how much money did he earn
murzikaleks [220]
He made $250 bc ten times twenty five is 250
3 0
3 years ago
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