exam Maths Puzzle Numerical Ability

(Use 10 steps)
Given: a and b intersect
Angle 1 is congruent to angle 2
Prove: a is perpendicular to b
Pls. use the two column proof...
The statement and the reason for this

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I have a couple more problems today I need steps and solutions for if anyone would be so kind.

Factor each difference or sum of two cubes.

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