I guess I'll solve this one and others can solve the rest

so by using CAST rule we know that this is in the second quadrant (S). so if you draw a triangle on the second quadrant, the length of the line parallel to the y axis is 1 unit and the length on the x axis is 7 units. You can now find hypotenuse using pythagorean theorem

then use

You can reduce the 50 under the root if you want