Substitution:
X + 2y = 13
-2x - 3y = -18

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

Each equation given below describes a parabola. which statement best compares their graphs? x = 2y^2 x = 8y^2

The sales totals at macy's food store have increased exponentially over the months. which of these best shows the sales in the first three months?