Phan chose an Internet service that charges
$18.00 per month plus $0.024 per minute.
Deion chose an Internet service that
charges$30.00 per month for unlimited usage. At
the end of the month, Phan's and Deion's charges
were identical. For how many minutes did Phan
use the Internet service that month?

He used the internet service for 50 minutes that month.

Step-by-step explanation:

m∠a is 90°

m∠b is 40°

statement #3: proof- ang is congruent to ang ecd : angles are congruent.  

step-by-step explanation:

1: the missing angles in statement #3  

a.) acb  

reason- the reason why the answer is acb is because angle ecd and angle acb are both the same size *that's what the word congruent means this is really simple.  

2: the missing word in reason #3  

c.) vertical  

reason- the reason why the answer is vertical is because the angles in that diagram on figure 2 is slanted, which is vertical, and the e and a both lay on vertical lines. along with the other's, but e and a are the 2 main points you want to focus on. and c is kind of like your starting point, because c is for both angles, not just one.  

i hope that was and understanding.