The largest triangle and the triangle whose hypotenuse is x are similar. So:
(21 + 4)/x = x/4
Cross multiply:
x^2 = 100
x = 10
Your answer is incorrect. It should be 10, not 20.
1.9 because if the number after it is lower then it is just the first number
The answer is F. I counted from the first line to the dot and said 25 the next line to the same amount of lines and so on and so forward.
