exam Maths Puzzle Numerical Ability

find the tenth term in the sequance:
13,17,21,25....
thanks for your time!

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exam Other Question

2x^2 + 3xy-4y^2 when x=2 and y= -4 (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