Salutations!
To find the nth term, you will be needing a formula.

a stands for the first term (first number in the sequence)
d stands for the difference between two terms. (always remember to subtract from the 2nd term to the 1st term)
and the n is what we are going to find
so in your sequence: 5, 10, 15, 20
5 is a (as it is the first term)
d would be 5 ( 10 -5 =5)




your nth term is

Hope this helps!
Have a great day!
Acute right complementary adjacent
G (x) = |x + 10| (if you mean horizontal translation to the left)
or g (x) = | x | + 10 (vertical translation 10 units up)
The answer would be the first one, combining 8 and -2
This is because the 2 like terms are 8x^2 and -2x^2. You can get this by looking in the problem. There are 2 terms with x^2 which means we have to combine them. One of them is 8x^2 (the 1st one) and the other is -2x^2 (since it says 7-2x^2)
If you combine these you will get 6x^2 [8+(-2)=6]