R = -2m + 11
S = n + 5
T = -m - 3n + 8
R - S + T
(-2m + 11) - (n + 5) + (-m - 3n + 8)
(-2m - m) + (n - 3n) + (11 - 5 + 8)
-3m - 2n + 14
Answer:
b=17.75 ft
Step-by-step explanation:
We will answer this using Pythagorean Theorem.
Since the bottom of a ladder is 3 feet from the wall, and the ladder is 18 ft long, the ladder is the hypotenuse. Knowing pythagorean theorem (a^2+b^2=c^2), we can plug it in.
3^2 + b^2 = 18^2
9+b^2=324
b^2=315
b=17.75 ft
