11. albert started a brownie-making business. he
spent $650 to purchase supplies to get started and
he uses about $2.25 worth of supplies per brownie
made. albert charges $5 for each brownie. let b
represent the number of brownies.
what is the minimum number of brownies albert
will need to sell to make a profit?
write an inequality to solve this situation and then
solve the inequality.

Acircle has the equation (x-2)^2 +y^2 =5. what are the coordinates of the circle's center?

The rate of decay of a radioactive substance depends upon the amount present initially. the mass y (mg) of the radioactive substance cobalt-60 present in a sample at time t (years) is represented by the exponential equation y=50e −0.1315 t . answer the following questions in complete sentences. 1. how does the exponential equation above compare to the equation for simple interest that is compounded continuously? explain the similarities. 2. what is the initial amount of cobalt-60 in the sample? 2. how much cobalt-60 is left after 8.4 years? show your work. 3. what would be the y-intercept of the graph? what does it represent? 4. after how many years will the amount of cobalt-60 left be 6.25 mg? explain what happens to the cobalt-60 after 50 years? 5. discuss some “real-world” examples and uses of cobalt-60

Apublic library wants to place 4 magazines and 9 books on each display shelf. the expression 4s+9s represents the total number of items that will be displayed on s shelves. simplify the expression