Tracy solved the system of equations by making a substitution for x in the second equation. what equation did she get as a result of that substitution? x = –2y – 2 2x + 3y = –6 –2y – 2 = –6 –2y + 1 = –6 -4y – 2 + 3y = –6 –4y – 4 + 3y = –6

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.

Ascientist has discovered an organism that produces five offspring exactly one hour after its own birth, and then goes on to live for one week without producing any additional offspring. each replicated organism also replicates at the same rate. at hour one, there is one organism. at hour two, there are five more organisms. how many total organisms are there at hour seven? 2,801 19,531 19,607 97.655

In the diagram of circle o, what is the measure of zabc?