Can someone pls explain how did he got this answer? I did not get 7 in my calculator. Pls thank u

You square 44 and 31 but you have two square cot². This is your error.

That's why you are getting wrong answer or you are not getting 7 in your calculator

the expression (1.26)2t reveals the approximate rate of increases in the number of plants semiannually.

hope this : )

i believe the answer is c.