Answer: AC=6.58, Angle A=20, BC=5.73
Step-by-step explanation: Sin is the opposite over the hypotenuse ratio for any given angle. Since we know am angle, 70, and we know the hypotenuse, 7, we can solve for the side opposite the angle. 7 x sin70= approx. 6.58, then using the Pythagorean theorem we get BC as 5.73 Hope this helps!