Which is the correct interval notation and why? A. (-∞,3]
B. (-∞,3)
C. [3,∞]
D. (3, ∞)

If a and b are the measures of two first quadrant angles and sin a = 4/9 and sin b = 2/5 find sin(a+b).

If you could answer these your a life saver

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.