Please help as soon as possible! Which two points have an undefined slope?
a.
(-1,1) and (1,-1)
b.
(-2,2) and (2,-2)
c.
(-3,-3) and (-3,3)
d.
(-4,-4) and (4,4)

Write the expression in simplified radical form. show all steps and work including any foil method work. (hint: use the conjugate. no decimal answers.) (9-2√3)/(12+√3)

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Find the y-intercept and x-intercept for the equation 5x-3y=60 what is the y-intercept