Answer:
B.
Step-by-step explanation:
The common difference is + 3 so we have an arithmetic sequence.
u(n) = a1 + d(n - 1)
= 9 + 3(n - 1)
= 9 + 3n - 3
= 6 + 3n.
Answer:
D
Step-by-step explanation:
Answer:
a) 9x + 12
b) 48 m
Step-by-step explanation:
Perimeter is the sum of all sides:
12 + 5x + 4x
12 + 9x
x = 4
12 + 9(4)
48
Answer:
2280 m³
Step-by-step explanation:
The formula for the volume of a cone of radius r and height h is V = πr²h. Here, that volume is:
V = π(11 m)²(6 m) = 726π m³, or 2280 m³
Answer:
1 ft²
Step-by-step explanation:
Left triangle, area = 10 x 7/2 = 35 ft²
Right triangle, area = 9 x 8/2 = 36 ft²
Difference = 1 ft²