Answer:
x=1/5
Step-by-step explanation:
you can also use mathpapa it's a calculator that gives you the answer and solves it for you step by step.
Use the pythagoras theorem:-
length = sqrt (19^2 - 4^2) = sqr (19-4)(19+4) = sqrt ( 345) = 18.6
(4 + 4 - 0.4) / 0.4 = (8 - 0.4) / 0.4 = 7.6 / 0.4 = 19
