The table shows a proportional relationship. what is the missing y-value?
x | 4 | 10 | 12 |

y | 6 | 15 | ? |

a.16
b. 20
c. 18
d.24

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?