Determine if the graph of the function is concave up or concave down.
1. f(x) = -4x^2 -2x -8

2. y = 2(x+5)^2 +5

3. y = -1/5 (x+1)^2 -1

The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?

Three times the sum of a number and seven is negative thirty-six. what is the number?

Tom is the deli manager at a grocery store. he needs to schedule employee to staff the deli department for no more that 260 person-hours per week. tom has one part-time employee who works 20 person-hours per week. each full-time employee works 40 person-hours per week. write and inequality to determine n, the number of full-time employees tom may schedule, so that his employees work on more than 260 person-hours per week. graph the solution set to this inequality.