What has four congruent angles but not four congruent sides?

Autility company burns coal to generate electricity. the cost c(p), (in dollars) of removing p percent of the some stack pollutants is given by c(p)= 85000p/100-p a) find the cost to remove 30% of the pollutant b) find where the function is undefined

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits