5x+4y=-12 Y=-2x-9 What is x

Somone me i want to know what 18 hours out of 24 hours in a fraction

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.

If value of cos330° is √3/2 then find tan165°.