a coal company burns coal to generate electricity. The cost percent of the pollutants from the is typically . is if it costs dollars to remove 25% the . cest more than 20 dollars to remove 50% of the . As the percent of removed pollutants approaches 100, the cost tends to become pto Suppose that the cost C dollars) of removing

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Vera is on her school's track and field team. in a practice long-jump competition against her teammates, she gets 5 points for landing over the farther line. she gets a total of 7 jumps and lands x times over the farther line and the rest of the times over the closer line. which of the following functions represents vera's total score? a. f(x)=10x b. f(x)=5x+35 c. f(x)=10x+5 d. f(x)=70-5x

These two squirrels live in the same ecosystem. what type of interaction do the images represent? a. direct competition b. mutualism c. interference competition d. symbiotic e. indirect competition