The value of a cake starts at $20, but decreases by $4 for every day it sits unsold. Write a function to model the relationship between the number of days (x) and the value of the cake (y).

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

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

Two poles, ab and ed, are fixed to the ground with the of ropes ac and ec, as shown: what is the approximate distance, in feet, between the two poles? 6.93 feet 8.66 feet 12.32 feet 15.59 feet