This is an arithmetic series, where S5 means the sum of the first 5 numbers in the series. The general formula is:
Sn = (n/2)(a1 + an)
So,
a1 = 1 + 5/2(1) = 3.5
a5 = 1 + 5/2(5) = 1.5
S5 = (5/2)(3.5+1.5)
S5 = 12.5
<em>The answer should be 12.5</em>
Total amount of grey blocks is 55 so divide that by the amount of columns it’s being divided into. The answers 5.
Answer:
its 6.75
Step-by-step explanation:
3/10 = 0.3
2/5 = 0.4
0.3 / 0.4 = 0.75
0.75 x 9 = 6.75
hope i helped
Answer:
3 = 95, 4 = 85, if a and b are parallel
Step-by-step explanation:
Answer:
b
Step-by-step explanation:
b makes the most sense out of all of them
