Find x plsasasss

What is the missing reason in step 5? linear pair postulategivendefinition of complementary anglescongruent complements theorem

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?

Rewrite 9 log, x2 in a form that does not use exponents. 9log, x = log, x