The total cost, in dollars, of an international call with duration x minutes is given by the expression . + .. What is the total cost, in dollars, of an international call with a duration of 10 minutes?

answer: approximately 206 bones

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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.