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algol13
3 years ago
9

The table shows the predicted growth of particular bacterium after various numbers of hours. Write an explicit formula for the s

equence of the number of bacterium.
What is the 12th term of the sequence 15, 11, 7, …?

Mathematics
1 answer:
Oksana_A [137]3 years ago
6 0

Answer:

D

-29

Step-by-step explanation:

Problem 1

In the first hour, the number of bacteria is 22

In the second hour,the number of bacteria is 44

It looks like the formula is some multiple of 22

That means you should pick D

Problem 2

n = 12

a = 15

d = - 4

an= 15 + (n - 1)*d

a12 = 15 + 11*(-4)

a12 = 15 - 44

a12 = - 29

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3 years ago
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2 years ago
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Answer: Hello there!

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Now there are 6 + 6 + 3 = 15 marbles in the bag, and 6 of them are red ones. Then the probability of getting one red is the number of red ones divided by the total amount ( which is the ratio of red marbles to total marbles)

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