3 + x/2 = 7
x = (7-3)*2 = 8 = the number
Answer:
Step-by-step explanation:
a1 = - 7
d = 4
an = a1 + (n - 1) * d
an = - 7 + (n - 1) * 4
an = - 7 + 4n - 4
an = -11 + 4n
Try this out. Let n = 3
a3 = -11 + 4*3
a3 = - 11 + 12
a3 = 1 Which is what the series says.
Step-by-step explanation:

Answer:
D
Step-by-step explanation:
Multiply the circumference by the diameter which is D