Answer:
84°
Step-by-step explanation:
Let the measures of the triangle be 5x, 7x, 3x.
By interior angle sum postulate of a triangle.
5x + 7x + 3x = 180°
15x = 180°
x = 180°/15
x = 12°
7x = 7*12°= 84°
Measure of the largest angle = 84°
Its the answer 764 so the surface area would be 764
Answer: 
Step-by-step explanation:
Given

Apply cross-multiplication

The value of k is 
<span>(x-8)(x+4)+(x-3)(x+9)
(x^2 + 4x -8x - 32) + (x^2 + 9x - 3x - 27)
x^2 - 4x - 32 + x^2 + 6x - 27
x^2 + 2x - 59
Answer: D
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