During a scientific experiment the temperature of a container decreased by $35.7\degree$ C at a constant rate over $8\frac{1}{2}$ hours. What value represents the change in the temperature of the container each hour? A $-8.9\degree$ C B $-4.4\degree$ C C $-4.2\degree$ C D $4.2\degree$ C

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

In need of in the diagram, ∠abc is a right angle. ∠dbc = 30°27'40". find the measure of ∠abd.

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?