Answer:
A
Step-by-step explanation:
Start with the 3.
You know that there is a difference of 4 between (say) 2 and 5. The 3 is a sign that the sequence is increasing. The members of the sequence are going up.
n - 1 means that the nth terms is calculated as an and uses the number of terms to be n-1. That means that the first term is a1 which is the starting point of the sequence.
The answer is an = a1 + (n-1)*d
d = 3
a1 = - 7
So let's try the formula out.
a4 = -7 + (4 - 1)*3
a4 = -7 + 3 * 3
a4 = -7 + 9
a4 = 2
Is 2 the 4th term in the series? Yes it is!
You can multiply 10 by 1/4 or .25
10x.25=2.5
Answer:
P = 24
A ≈ 41.6
Step-by-step explanation:
The polygon is a regular hexagon, so the triangle shown is a 30-60-90 triangle. So the short leg of the triangle is 2, which makes the side length of the hexagon 4.
That means the perimeter is P = 4 × 6 = 24.
The area of a regular polygon is:
A = ½ aP
where a is the apothem and P is the perimeter.
A = ½ (2√3) (24)
A = 24√3
A ≈ 41.6
H = -2r + s/πr
C = 3A-a-b
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