I believe its 45 because a right angle equals 90 degrees and if you multiply 45 and 2, it'll give you a right angle(90 degrees)
a. (2175 mi)/(18 mi/day) = 120.83... day ≈ 121 days
b. 120.83.../4 = 30.2083...
Joelle will hike 30 full days and one partial day.
Greetings!
"<span>The difference of six times a number and 7 is -49"...
In number and variables, this would be:
</span>

<span>
Add
7 to both sides.
</span>

<span>Simplify.
</span>

Divide both sides by
6.

Simplify.

Hope this helps.
-Benjamin
Answer:
First 3 boxes down are Vertical, Complementary, Supplementary
. Second 3 Boxes Down Are add up to 90 degrees, add up to 180 degrees, and are congruent.
I hope this helps :)