The part the it is multiplying by the placholder (not adding)
example
2+4x
4 is placeholder, 2 is not
x and y are placeholders
5/3 is not
5/3 is the coefient
The sum of the arithmetic series 6 8 10 12 14 16 18 20 22 24 26 is 176
<h3>How to determine the sum of the series?</h3>
The series is given as:
6 8 10 12 14 16 18 20 22 24 26
The above series is an arithmetic series with the following parameters:
First term, a = 6
Last term, L = 26
Number of terms, n = 11
The sum of the series is calculated using:

This gives

Evaluate

Hence, the sum of the arithmetic series 6 8 10 12 14 16 18 20 22 24 26 is 176
Read more about arithmetic series at:
brainly.com/question/6561461
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Answer:
12 cm
Step-by-step explanation:
The area (A) of a trapezium is calculated as
A =
h (a + b)
where h is the perpendicular height and a, b the parallel bases.
Here A = 45, h = 5, a = 6 and b = ?, thus
45 =
× 5 × (6 + b) = 2.5(6 + b) = 15 + 2.5b ( subtract 15 from both sides )
30 = 2.5b ( divide both sides by 2.5 )
b = 12
The measure of the other parallel side is 12 cm
120 : 8 = 15
and 15 x 20 = 300, so the answer is C