Matrices always go row x column.
Count the rows: 4
Count the columns: 3
The matrix is a 4 x 3 matrix
Answer:

Step-by-step explanation:
First you take 3x times 2x since its the first of both equations, which will give you 6x squared.
Then take the outer ones of both problems which is 3x times 3 which is 9x.
Then the inner, -2 times 2x which is -4x
Then the last of both individual problems which is -2 times -3 which is positive 6.
Answer:
The standard deviation is 0.1104. The 10% condition is met because it is very likely there are more than 200 minnows in the pond.
Step-by-step explanation:
The standard deviation for a proportion is:
σ = √(pq/n)
where p is the proportion, q is 1−p, and n is the sample size.
σ = √(0.58 × 0.42 / 20)
σ = 0.1104
Since the pond is large, there's probably more than 200 minnows, so the 10% condition is met.
Answer:

Step-by-step explanation:
To better understand the problem see that attached figure with letters
we know that
In the right triangle BCD
----> equation A
we know that
In the right triangle ABC
-----> equation B
equate equation A and equation B
