Question 1) https://imgur.com/a/WcGFO

Question 2) https://imgur.com/a/r40uy

Question 3) https://imgur.com/a/yzd0e

Thank you

Johnnyboy Feb 22, 2018

#1**+2 **

First one

A tangent to a circle meets a radius at right angles

So ABD = 90°

Second one :

Ths is the intersecting chords theorem....specifically, we have that

9(n + 7) = 18(n + 1) divide both sides by 9

n + 7 = 2(n + 1) simplify

n + 7 = 2n + 2 subtract n, 2 from both sides

n = 5

Last one

Notice that ABC = 180 - 47 - 48 = 85°

But ABC would have to = 90° for BC to be tangent

So...the second answer is correct

CPhill Feb 22, 2018