Me with these two math problems that i do not quite understand. this is urgent!

write an explicit formula for each explicit formula a(n)=-1+(n-)

describe and correct the error at the right in finding the tenth term of the arithmetic sequence 4,12,20,28.

1)

2)

Step-by-step explanation:

1) To write an Arithmetic Sequence, as an Explicit Term, is to write a general formula to find any term for this sequence following this pattern:

"Write an explicit formula for each explicit formula A(n)=-1+(n-1)(-2)"

This isn't quite clear. So, assuming you meant

Write an explicit formula for each term of this sequence A(n)=-1+(n-1)(-2)

As this A(n)=-1+(n-1)(-2)  is already an Explicit Formula, since it is given the first term the common difference let's find some terms of this Sequence through this Explicit Formula:

2) In this Arithmetic Sequence the common difference is 8, the first term value is 4.

Then, just plug in the first term and the common difference into the explicit formula:

4 + 5 7/9= 9 7/9

step-by-step explanation: