Recycled cds, incorporated, offers a choice of 5 used cds for $30, with each additional cd costing $7. write a cost function for purchasing 5 or more cds. what will the cost of buying 8 cds be? let x represent the number of cds over 5.

Acable company wants to provide cell phone service for residents on an island. the function for the cost of laying the cable from the island to the mainland is c(x)= 6.500 square root x2+4, where x represents the length of the cable in feet. what are the domain and range of the function? a) domain: all real numbers range: all real numbers greater than or equal to 17,000 b) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 17,000 c) domain: all real numbers greater than or equal to 0 range: all real numbers greater than or equal to 13,000 d) domain: all real numbers greater than or equal to 13,000 range: all real numbers greater than or equal to 0

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog