Answer:
418
Sn = ∑ 3 +4(n-1)
n=1
Step-by-step explanation:
3,7,11,15,.....1671
a1 =3
d = 4 (7-3=4)
an = a1 + d(n-1)
an = 3 +4(n-1)
We need to determine the last term
1671 = 3 +4(n-1)
Subtract 3
1671-3 = 3-3 +4(n-1)
1668 = 4(n-1)
divide by 4
1668/4 = 4(n-1)/4
417 = n-1
Add 1 to each side
418 = n
418
Sn = ∑ a1 +d(n-1)
n=1
418
Sn = ∑ 3 +4(n-1)
n=1
I think the answer ia A that what i think
Answer:
Area of the square:
12 x 16 = 192
Area of the semi circle on top:
16 - 8 = 8 is your diameter
half of 8 is 4.
I got 8 from adding the two fours on the side of that semi circle on top.
4^2 x 3.14
16 x 3.14 = 50.24
50.24 divided by 2 = 25.12
Area of the semi circle on the side:
12 - 8 = 4
4 is your diameter and half of that which would be your radius is:
2 so
2^2 x 3.14
4 x 3.14 = 12.56
12.56 divided by 2 = 6.28
Now we are going to add all the areas:
192 + 25.12 + 6.28 = 223.4 is your answer
the answer to your question is 6/7 × 1 1/4 = 3/14
