How can we tell if a number is divisible by 4?

a. the sum of the digits is 4

b. the sum of the digits is divisible by 4

c. the last digit is divisible by 4

d. the last two digits of the number are divisible by 4

In 2009, there were 1570 bears in a wildlife refuge. in 2010, the population had increased to approximately 1884 bears. if this trend continues and the bear population is increasing exponentially, how many bears will there be in 2018?

What is r i 4.5+10r=-6.5 with work pls

Complete the equation of the live through (-1,6) (7,-2)