What is the first step to solve for 7 − 4 = 18? * A. Add -7 on both sides of the equation

B. Add 7 on both sides of the equation.

C. Multiply -4 on both sides of the equation.

D. Multiply on both sides of the equation.​

In 1950, scientists estimated a certain animal population in a particular geographical area to be 6,400. in 2000, the population had risen to 7,200. if the animal population experiences the same percent increase over the next 50 years, what will the approximate population be? a) 8,000 b) 8,100 c) 8.400 d) 8.600