They take about 5,000 to 10,000 steps each day.
Helps!
Supplementary means that the angles have to add up to 180, so you have your equation.
180=5x+17x-18
198=22x
x=9
Then to find the measures of the angles, you plug x back in.
m∠ABD=5(9)=45 degrees
m∠BDE=17(9)-18=153-18=135 degrees
I think that it would be C, but I am debating on C and D. I'm pretty confident that it's C, though. Pretty sure.