Answer:
(A)

(B)

Step-by-step explanation:
(A)
we are given


Firstly, we will find few terms









so, we will get terms as
5, 7 , 9 , 11
we can see that this is arithematic sequence
First term =5
common difference =d=7-5=2
now, we can use nth term formula

now, we can plug values



(B)
we can plug n=10


Answer:

Step-by-step explanation:
You have what is called "perfect squares" so you can use the "difference of squares formula to factor:

So,

you can work the equation backward now and you will get your original equation.
Answer: For no solution it would mean that there is no answer to the equation. For infinite solutions it would mean that any value for the variable would make the equation true.
Explanation: For example of no solution 6=5 as you can tell 6 is not the same to 5 so there is no solution. More examples are 2=3, 8=10, and 1=0. For infinite solutions examples are 2=2, 7=7, and 10=10 as we can see 2 does equal 2 and 7 equals 7 which makes it true and infinite.