The answer is 5.05 bro you stupid

**Answer:**

B. stratified.

**Step-by-step explanation:**

If a population is composed by i**dentifiable groups or strata, with large variations between groups,** the **stratified sampling** should be applied in order** to comprehend and represent all of the different groups** in the sampling process.

Therefore, the answer is alternative **B. stratified.**

**Answer:**

False

**Reasoning:**

- It's an acute angle, 140 is obtuse

- Angles 6 and 8 are 140 degrees, so 5 can't be

I did this problem last year, if I remember you do this:

64 pounds of gravel and <span>108 pounds of mulch will be the outcome

</span>

*2 1/4 will be equal to 2.25

*1 1/3 will be equal to 1.33

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2.25 / 1.33 = 1.7 is fine (rounded up)

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*ratio of gravel = 1.7: 1

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FOR MULCH:

1.7/2.7 from 172 you will use the outcome 0.629 * 172 to get 108.2 pounds

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FOR GRAVEL:

172 - 108.2 = 63.8 pounds

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Totals sold will be:

- 108 Pounds

- 64 Pounds

81x^4-1=(9x^2-1)(9x^2+1)

=(3x-1)(3x+1)(9x^2+1)