In the diagram below, D is the circumcenter. If BD = 7a - 4 and CD = 4a + 11, what is the length of AD?

What is the smallest integer n such that n\sqrt{2} is greater than 20

Asequence is defined recursively by the formula  f(n  +  1)  =  f(n)  +  3 . the first term of the sequence is  –4. what is the next term in the sequence? –7–117

"princess tower" in dubai is considered the world's tallest residential building, towering to 1 0 1 101 floors! t ( n ) t(n) models the number of tenants living on floor n n of the tower. what does the statement t ( 2 0 ) = t ( c ) t(20)=t(c) mean?