The difference of the blue crab population From 1990-1997, the average was (800+750)/2 = 775; and from 1989-2009: (350+350)/2 = 350. I predict that from 2010 to 2020 the population will increase to about 500 because it seems to go on trends of increasing and decreasing.
Answer:
There are about 5,357 bees in the hive
Step-by-step explanation:
Let
x -----> the number of bees that leave the hive in one minute
y -----> the approximate number of bees in a hive
we know that
The formula to calculate the approximate number of bees in a hive is equal to

For x=25
substitute


therefore
There are about 5,357 bees in the hive
Answer: A. 1.2
Step-by-step explanation:
Given : Sample size : n= 64
Standard deviation: 
The formula to find the standard error of mean is given by :-

Therefore, the standard error of the mean= 1.2
Hence, A is the right option.
Answer:
A
Step-by-step explanation:
First, find Neeta's total height in inches:
4 feet in inches is 4*12, which equals 48
Add the other 7 inches of her height to get 55 inches.
Then, subtract her initial height from her current height.
55 - 17 = 38. That is how many inches she has grown. Convert that to feet by dividing 38 by 12.
You get about 3.16, which is over 3 feet. So A is the correct answer.
(-4)^2-4(1)(5)
16-4(1)(5)
16-4(5)
16-20
-4
The discriminant is negative so there are no real number solutions.