A caterer charges $123 to cater a birthday party for 20 people and $239 for 30 people. Assume that the cost, y, is a linear function of the number of people, x.
How much would a birthday party for 88 people cost?

Write a corresponding real world problem to represent 2x - 125=400

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.

Find the area of the triangle formed by the origin and the points of intersection of parabolas y=−3x^2+20 and y=x^2−16.