Which of the following represents the length
of the missing side to the nearest tenth?

8.9

Step-by-step explanation:

Use Pythagorean Theorem (a²+b²=c²)

a²+8²=12²

a²+64=144

Subtract 64 to both sides

a²=80

Square root both sides

a=√80

√80≈8.9

35x 3= 105

step-by-step explanation:

35+35= 70   70 + 35= 105

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.