okay so I need help with this I have it missing and I don't know how to do this I hope you can help me

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6.- All its sides are different so it is a Scalene triangle ( by its sides) also is an acute triangle because its three angles measure less than 90°.

10.- Also is a Scalene triangle and an acute triangle.

5.- It's an Scalene triangle because all its sides have a different length

it's an obtuse triangle because 1 of its angles measure more than 90°.

15.-

8x + 4 + 80 + 3x - 6 = 180

11x + 78 = 180

11x = 180 - 78

11x = 102

x = 102/11

13.- 64 + 27 + 97 + x = 180

x = 180 - 64 - 27 - 97

x = -8

16.-

x + 23 + 80 + 4x + 17 = 180

5x = 180 - 23 - 80 - 17

5x = 60

x = 12

17.- 5x + 10 + 58 + 180 - 11x - 2 = 180

-6x = -10 - 58 + 2

-6x = -68 +2

-6x = -66

x = -66/-6

x = 11

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,