Explain why this triangle cannot be drawn. Angle 35 Hyp 10 Opp 7 Adj ?

Because of the sides given for the angle, we need sin().

sinx = Opp/Hyp

sin35 = 7/10

0.574 != 0.7

Because the sin() of the given angle is not equal to the opposite side length divided by the hypotenuse side length, we know the triangle is impossible.