How do I interpret constants of proportionality

12 out of 30 people chose their favourite colour as blue caculate the angle you would use for blue on a pie chart

The poll report includes a table titled, “americans using cash now versus five years ago, by age.” the age intervals are not equal. why do you think the gallup organization chose the age intervals of 23–34, 35–54, and 55+ to display these results?

Write an expression that represents the sum of 7 and x