Ineed with this problem problem plz i don't understand this problem problem

Mr.walker is looking at the fundraiser totals for the last five years , how does the mean of the totals compare to the median?

In δabc, m∠acb = 90°, cd ⊥ ab and m∠acd = 45°. find: a find cd, if bc = 3 in

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove