Answer: 1. 10
2. an = an - 1 + 7 where a1 = -10
Step-by-step explanation:
A^2 +b^2 = c^2
a= wall
b = ground (18)
c = ladder (25)
a^2 + 18^2 = 25^2
a^2 + 324 = 625
a^2 = 301
a = 17.349
It is 70° because the other triangle has the same angle and it is labeled 70° in the other triangle.
Answer: 70°
