Find the sum of the following arithmetic series 7+13+19+25+...+85

Step-by-step explanation:

Given Arithmetic series is:

7+13+19+25+...+ 85

Here,

First term a = 7

Common Difference d = 13 - 7 = 6

last term

First let us find the number of terms in given series.

Hence, given series has total 14 terms.

Sum of n terms of an Arithmetic series is given as:

step-by-step explanation:

because 1/3 is a fraction. we can tell because there is a divisor symbol between the 1 and the 3. if we were to add 2 fractions together, we would add the numerators, which is the number on top, but not the denominators, which is the number on the bottom

1/3+1/3=2/3

hope this !

25.3

step-by-step explanation:

1st step

add 3+6

=9

multipy 9*3

=37