A
this is an arithmetic sequence whose n th term ( explicit formula) is
=
+ (n - 1 )d
where d is the common difference and
the first term
here d = 10 - 8 = 8 - 6 = 6 - 4 = 2 and
= 4, hence
= 4 + 2(n - 1 ) = 4 + 2n - 2 = 2n + 2 → A
2.8+7.2=10 all you had to do was just add

The equations are :
The given pair of equations have infinitely many solutions.
(because the first equation is the product of second equation with -2)
Hello!
452.84 rounded to the nearest hundreds place is 
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452.84
The number in the hundreds place is 4. When the question asks you to round to the nearest hundreds place, it simply means to round <em>that number </em>either up or down. For example, if the number were 449.84, you would round to 400, as that would be the nearest hundred. Since the digit in the tens place was 5, we rounded <em>up. </em>