This is a simple "solve for x" equation.
5k-2k=12
3k=12
k=4
You should try doing some more on your own, as this will be coming up a lot in the future.
Hey there Katie,
Your question states: Type the correct answer in the box. Use numerals instead of words. If necessary, use / for the fraction bar. ∆ABC rotates 90° clockwise about point P to form ∆A′B′C′. So if we were to rotate the shape 2 which is ∆A′B′C′ toward to P. That would leave us with a 90° angle. So in this case,It would be B'A'C'∆.
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Hope this helps you Katie!
~Jurgen
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it is 65 complementary angles add up to 90
if you need more help let me know :)