Step-by-step explanation:
sum of the arithmetic sequence
a1 = 8
a2 = a1 + 8 = 8+8 = 16
...
an = 8×n
the sum of the first n elements of such a series is
n/2 × (2×a1 + (n - 1)×d]
with d being the difference between 2 consecutive elements (= the added constant).
so,
s30 = 30/2 × (2×8 + 29×8) = 15×(31×8) = 3720
Answer:
The answer is 10
Step-by-step explanation:
a + 5 =15
15-5=10
8 more red circles because if you have 9 red circles and 3 blue ones the ratio would be 9:3 and if you simplify that down to 3:1 that’s the answer. So you would need to add 8 more red circles
Answer: -2/3
Step-by-step explanation:
Answer:
The answer is: 3 feet.
Step-by-step explanation:
The area is found by multiplying the width times the length. For a square, the length = the width.
Multiply 3 * 3 to get 9. So each side is 3 feet.
