We let
a1 = first term
a2 = second term
a3 = third term
and so on
We are given with
a1 + a2 = 26
S5 (sum of five terms) = 35
The formula for the sum of terms is
Sn = (a1 + an) (n/2)
SO
35 = (a1 + a5) (5/2)
The formula for an arithmetic term is
an = a1 + d(n-1)
For
a2 = a1 + d
we know that
a1 + a2 = 26
Simply for a1, a2, and d. Then use the formula to get the other items asked.
53+n=(58+10)
n=15
emma got 15 marbles from fred
Answers:
The expression is equivalent to a rational number.
The expression represents the sum of two rational numbers.
I think it would be 363.21 because you are moving the digits down by 10
