Are the lines parallel, perpendicular, or neither?
5x + 2y = 10
15x + 4y = -4

Which sum or difference identity would you use to verify that cos (180° - ∅) = -cos ∅? a. sin (α -β) = sin α cos β – cos α sin β b. cos (α -β) = cos α cos β – sin α sin β c. cos (α -β) = cos α cos β + sin α sin β d. sin (α + β) = sin α cos β + cos α sin β

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

Credit card a offers an introductory apr of 3.4% for the first three months and standard apr of 15.7% thereafter,