Which expression is equivalent to sin(20°)cos(80°) – cos(20°)sin(80°)? A) sin(-60)
B) cos(-60)
C) cos(60)
D) sin(60)

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)

Write the equation of the line that passes through (3, 4) and (2, −1) in slope-intercept form. (2 points) y = 3x − 7 y = 3x − 5 y = 5x − 11 y = 5x − 9

Arectangle has a perimeter of 20 cm. the length, x cm, of one side of this rectangle is uniformly distributed between 1 cm and 7 cm. find the probability that the length of the longer side of the rectangle is more than 6 cm long.