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Lera25 [3.4K]
3 years ago
7

PLEASE HELP ME 30 POINTS!!! :DDDD

Mathematics
1 answer:
GalinKa [24]3 years ago
7 0

well it's not c........

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The altitude of an equilateral triangle is 9 inches. Find the perimeter of the triangle in inches.
Fiesta28 [93]
If we  draw a perpendicular line from one of the vertices of the triangle we get  2 right angled triangles  each with  altitude 9 ins  and vertex angle = 30 degrees.   So:-

cos 30 = 9 /h     where h = one of the sides of the equilateral triangle

h =  9 / cos 30  =  10.392 inches

Therefore the perimeter of the triangle = 3 * 10.392 =  31.1769 ins

Answer is 31.18 inches to the nearest hundredth.
5 0
3 years ago
2x-7=117 what is the value of x
Tcecarenko [31]

2x - 7 = 117

Add 7 to both sides

7 + 2x - 7 = 117 + 7

At the left hand side 7 will cancel 7

At the right hand side 7 will add up

2x = 124

Divide through by 2

x =  \frac{124}{2}

simplify the fraction

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4 0
3 years ago
Divide 9x4 - 6x2 + 3x2 by 3x2 -1.
bulgar [2K]

Answer:

3x^2 is the final solution

See the image below for step by step explanation.

7 0
3 years ago
Can you help me plz? I'll mark brainilest
Vladimir79 [104]
The answer is amplitude
8 0
3 years ago
Solve for k.<br> (k)4+ 3= 14<br> ​k=<br> ​
r-ruslan [8.4K]
Solving for "K" , got it! :)
I'll make it easier to solve

(k)4+3-14=?
? = 0

4(k)-11 = 0 

Take off the '0' and the addition symbol so we can add from 11 on your sides

4(k) - 11
+11   +11
---- ----
15k. 22
      ⬆ This would be your answer for k            

 4(k) = 11
÷4 ÷4
--- ----
1K ?

K = 11/4 (for fraction)
K = 2.75 (as a decimal)
5 0
4 years ago
Read 2 more answers
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