Describe what is wrong with the simplification shown. cos x - cos x sin^2 x = cos x - cos x (1 + cos^2 x)

=cos x - cos x - cos^3 x

=-cos^3 x

Solve the system. -a+4b+2c=-8 3a+b-4c=9 b=-1 a.(0,11) ,-1,2) c.(1,1,-2) d.(2,-1,-1)

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Barney & noblet customers can choose to purchase a membership for $25 per year members receive 10% off all store purchases 1. how much would a member pay per year if he bought $50 worth of items each year? 2. write a slope-intercept equation that expresses how much a member pays per year using x to represent his purchases per year 3. how much would a member have to spend per year to pay off his membership fee?