Answer:
Step-by-step explanation:
Let's write out a case for two specific questions being correct and the rest being incorrect:
,
The 
represents the chances of getting the question correct, as there are 5 answers and 1 correct answer choice.
The 
represents the chances of getting the question incorrect, as there are 5 answers and 4 incorrect answer choices.
The equation above does show the student getting two answers correct and three answers incorrect, but it only shows one possible case of doing so.
We can choose any two of the five questions to be the ones the student gets correct. Therefore, we need to multiply this equation by the number ways we can choose 2 from 5 (order doesn't matter): 
.
Therefore, the probability the student gets two questions correct is:
We have, by function notation, that
f(2)=3(2)=5
now we have
2x-3=5
2x=8
x=4
So the answer to this is 4
Hope this helped :)
Have a great day
Answer:
I believe the answer is C.
Step-by-step explanation:
:)
Hope this helps!
<3
Angle between 
is 
° .
<u>Step-by-step explanation:</u>
We have , two vectors u = <-5, -4>, v = <-4, -3> or ,
We need to find angle between these two vectors . Let's find out:
We know that dot product of two vectors is defined as :
, where x is angle between u & v !
⇒
⇒ 
Now , 
⇒ 
⇒ 
{ 
}
⇒ 
Now , Modulus of any vector 
is 
So ,
Putting all these values in equation we get:
⇒ 
⇒ 
⇒ 
{ 
}
⇒ °
Therefore , Angle between is ° .
