When a number is decreased by -8 and the result is -20. What is the number? THANKS you for your help

-12

Step-by-step explanation:

To decrease by -8 is to subtract, therefore x-8= -20. When you add 8 on both sides, the answer is -12.

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.