What's the property of -2(x-y)=-2x+2y

What is sin 7x/4 ? i need on this urgent trig

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left