Which of these sequences is a geometric sequence?

1, 2, 4, 7, 11, 16, 22, ...

2, 4, 8, 14, 22, 38, ...

3, 6, 9, 12, 15, 18, 21, ...

3, 9, 27, 81, 343, 729, ...

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Suppose a student usually gets 5.28 hours of sleep. A teacher wants the student to get 8 hours of sleep. What is the percent increase in the number of hours that the student will sleep? Round your answer to the nearest whole percent.

On the planet of Mercury, 4-year-olds average 3.2 hours a day unsupervised. Most of the unsupervised children live in rural areas, considered safe. Suppose that the standard deviation is 1.

Why is multiple of 8 also multiple of 2 and 4

If the sum of three consecutive odd integers is at most 216, what is the largest possible value of one of these integers? A. 69 B. 71 C. 73 D. 74

It is known that a polynomial has solution if - 1 and 3i. What is the lowest possible degree polynomial with these solutions? (1) 1 (2) 2 (3) 3 (4) 4

Number patterns 54, 18, 6, 2, 2/3, what are the next 2 terms?

Square root of 7 plus 5i divided by square root of 5 plus 2i

Find the digits in the ones place, in the hundredths place, and in the ten thousandths place for the following number. 361.9167

A turtle is at the bottom of a 20 foot well. Each day it crawls up 4 feet but it slips back 2 feet. After how many days will the turtle reach the top of the well?

Y = - 4 * 2x is a reflection of y = - 1/4 * 2x. True or false?