exam Maths Puzzle Numerical Ability

Given: h is parallel to d
Prove: m<11+m<10+m<18=180

the three angles make a triangle.

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exam Other Question

I need help for this problem:
Show that √2 + √(5 - 2√6)= √3
Find the slope of the line.

The graph shows y= (0,8)
x= (3,-7)

The slope of the line is m= -5