The question is in the attachment, i've posted a question similar to this before.

I wrote the equation B+12+B=90. If angle A is 12 degrees greater, that means if you take away the difference of twelve, they will be equal. Since complementary angles all add up to 90 degrees: A+B=90-12. A+B=78, and 78/2 is 39. This means A is 51 degrees and B is 39 degrees.

√124

=√4 x 31

=√2 x 2 x 31

=√2 x 2 x √31

=2 x √31

=2√31