Please help for today For a certain kind of plaster work, 2.5 cu yd of n are needed for every 100 sq yd of surface. How much sand will be needed for 270 sd yd of surface

Identify the type of observational study described. a statistical analyst obtains data about ankle injuries by examining a hospital's records from the past 3 years. cross-sectional retrospective prospective

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]

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.