Answer:
<h3>D</h3>
Step-by-step explanation:

<span>A. 8x+3x = 11x
B. (8+3)x = 11x
C. 11x = 11x
D. 11x^2 = 11x^2
answer
</span><span>D. 11x^2</span>
Answer:
C
Step-by-step explanation:
X can’t have 2 y’s
Answer:
x = 17 / sqrt (2)
Step-by-step explanation:
first we have to notice that we have a right triangle, this means we can apply Pythagoras
h^2 = c1^2 + c2^2
then we just have to put the values we have and solve the equation
17^2 = x^2 + x^2
289 = 2(x^2)
289/2 = x^2
√289/2 = x
√289 / √2 = x
17 / √2
17 / sqrt (2)
Answer:

Step-by-step explanation:
The question is incomplete, as what is required is not stated and the triangle is not given.
So, I will solve generally.
The proof is as follows (see attachment for triangle)
From the attachment, we have:



Make f, e and d the subject



Add up the equations

Collect like terms


We have:

--- angles in a triangle
So, we have:

--- proved