What formula is used to find the circumference of a circle?

isn't it c = 2πr ?

Acertain population of bacteria demonstrates exponential growth doubles in size every 4 days. how long will it take the population to triple in size?

Which statement about the relative areas of δabc and δxyz is true? the area of δabc > the area of δxyz the area of δabc < the area of δxyz the area of δabc = the area of δxyz more information is needed to compare.

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10