Flower: anthony decides to decorate a ballroom with r= 3n + 20 roses, where n is the number of dancers. it occurs to anthony that the dancers always come in pairs. that is, n=2p, where p is the number of pairs. what is r as a function of p?
can anyone explain the process of how to answer this problem?

7. the area of the playing surface at the olympic stadium in beijing isof a hectare. what area will it occupy on a plan drawn to a scaleof 1: 500?

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (-4, 0) and (6,0). the y-intercept of thefirst parabola is (0, –12). the y-intercept of the second parabola is (0-24). what is the positive difference between the avalues for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth.

Find the value of x for which line a is parallel to line b