exam Maths Puzzle Numerical Ability

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exam Other Question

(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 th A salesman gets a comission of $2.65 on each item sold. One morning he sold 15 calculators and 19 pocket radios. Find his Commission

Hi i forgot how to solve problems like this can you show steps and answer please