Answer:
Step-by-step explanation:
4 - (-19) = 4 + 19
= 23
By 32,760 different ways can a researcher select 4 rats from 15 rats and assign each to a different test .
<u>Step-by-step explanation:</u>
We need to find How many different ways can a researcher select 4 rats from 15 rats and assign each to a different test.Let's find out:
We will use Permutation here : As we will chose 4 rats out of 15 rats , order will be considered which will make this as a permutation problem . Formula for permutation is given by :
⇒ 
According to question , we have
⇒ 
⇒ 
⇒ 
⇒ 
⇒ 
Therefore , By 32,760 different ways can a researcher select 4 rats from 15 rats and assign each to a different test .
Add up all of the exponents

has a degree of
Step-by-step explanation:
Given
(2x + 3 )² - (2x + 3) (x - 5)
= 4x² + 6x + 9 - ( 2x (x - 5) + 3(x - 5 ))
= 4x² + 6x + 9 - ( 2x² - 10x + 3x - 15 )
= 4x² + 6x + 9 - 2x² + 10x - 3x + 15
= 2x² + 13x + 24
Hope it will help :)
Answer:

Step-by-step explanation:
Given
Parallel: 
Passes through (1,5)
Required
Determine the equation
Because it is a parallel to
then they have the slope.
The slope of
is 2 i.e. from 
So:

The line equation is then calculated using:



