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dybincka [34]
2 years ago
10

HELP Math will give 25 brainly points

Mathematics
2 answers:
aleksklad [387]2 years ago
7 0
51 degrees should be the correct answer
77julia77 [94]2 years ago
4 0

9514 1404 393

Answer:

  51°

Step-by-step explanation:

The angles where the expressions are given are a linear pair, so total 180°.

  (3x +15) +(10x +9) = 180

  13x = 156 . . . . . . . . . . . . . . . subtract 24, collect terms

  x = 156/13 = 12

Then the acute angle is ...

  3x +15 = 3(12) +15 = 36 +15 = 51

The stairs make an angle of 51° with the basement floor.

_____

<em>Additional comment</em>

Building code requires the rise to be not more than 8 and the run not less than 9, so the maximum angle is about 41.6°. A 51° staircase would not meet code.

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Find the value of x needed to make the equation True. 3/4(20x-8)-3=54
olasank [31]

Answer:

The answer is option B, x = 4.2

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2 years ago
What is the slope of-5y=2x
kogti [31]

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2 years ago
The floor of a gazebo is in the shape of a regular octagon. The perimeter of the floor is 72 feet. The distance from the center
Katyanochek1 [597]
The length of one side of the octagon is given by:
 L = 72/8&#10;&#10;L = 9
 Then, the apothem can be determined using the Pythagorean theorem in the following way:
 11.8 ^ 2 = (9/2) ^ 2 + a ^ 2&#10;
 Clearing to have:
 a ^ 2 = 11.8 ^ 2 - (9/2) ^ 2
 a = \sqrt{11.8 ^ 2 - (9/2) ^ 2}
 a = 10.91
 Then, the area is given by:
 A = (8) * (1/2) * (L) * (a)&#10;
 Where,
 L: length of the octagon sides
 a: apotema
 Substituting values:
 A = (8) * (1/2) * (9) * (10.91)&#10;&#10;A = 392.76 feet ^ 2
 Answer:
 
the approximate length of the apothem is:
 
a = 10.91 feet
 
The approximate area of the floor of the gazebo is:
 
A = 392.76 feet ^ 2
8 0
3 years ago
Read 2 more answers
Pls help asap!!!!!!!!
wel

Answer:

It is possible, because the two shortest sides have to add up to be more than the longest side, and 8 + 12 = 20, which is more than the longest side of 17.

So yes, I agree with Bear.

3 0
3 years ago
Graph the system of linear inequalities.<br> y &gt; 2x − 2<br> y &lt; 2x + 3
vesna_86 [32]

Answer:

u should use des mos . com

7 0
3 years ago
Read 2 more answers
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