B. 18.37
1990 - 1960 = 30 = t
Plug in the variable "t" to the equation and solve.
P (t) = 18.37
Hello, we know there are 12 inches in one foot, so in 12 feet, there are 144 inches.
Answer: The correct answer is C.
Step-by-step explanation: C Shows multiple animals and shows plants. It also shows water which is needed in an ecosystem.
Hope this helps!
