What is the length of the hypotenuse?

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

One month, a music site observed that 60% of the people who downloaded songs from its site downloaded q sam's latest single. the equation below represents this information, where x represents the total number of people who ddownloaded songs from the site that month: x = 0.6x + 384 how many people who downloaded songs from the site that month downloaded q sam's latest single?

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles