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3 years ago

Please help me! Giving right answer brainiest!

Mathematics

1 answer:

motikmotik3 years ago

4 0

<span>A. an observational study, since they were not assigned to their groups.</span>

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Please i need an answer urgently. Sum of 3 terms are 252, first term is 192. Find common ratio

Viefleur [7K]

Answer:

$r=\frac{1}{4}\\\\r=-\frac{5}{4}$

Step-by-step explanation:

<u>Geometric Sequences</u>

The geometric sequence is given as:

$a_1, a_1r, a_1r^2, a_1r^3,..., a_1r^{n-1}$

Where n is the number of the term, n≥1, and r is the common ratio.

The sum of n terms of the geometric sequence is given by:

$\displaystyle S_n=a_1\frac{r^n-1}{r-1}$

We are given: S3=252, a1=192, thus substuting:

$\displaystyle 252=192\frac{r^3-1}{r-1}$

Dividing by 12:

$\displaystyle 21=16\frac{r^3-1}{r-1}$

Recall that:

$r^3-1=(r-1)(r^2+r+1)$

Substituting:

$\displaystyle 21=16\frac{(r-1)(r^2+r+1)}{r-1}$

Simplifying:

$21=16(r^2+r+1)=16r^2+16r+16$

Rearranging:

$16r^2+16r+16-21=0$

16r^2+16r-5=0

Rewriting:

$16r^2-4r+20r-5=0$

Factoring:

$4r(4r-1)+5(4r-1)=0$

$(4r-1)(4r+5)=0$

Solving:

$r=\frac{1}{4}\\\\r=-\frac{5}{4}$

Both solutions are valid

6 0

3 years ago

The volume of the cube is given as V= x³, where x is the side length of the cube. Find the domain of the volume of

katovenus [111]

Answer: None of the choices

Step-by-step explanation:

1. It couldn't be integers (whole numbers positive or negative), because a cube couldn't have a negative volume.

2. It could be natural numbers, but the problem is, that a volume could have decimal values, for example, 3.62 meters cubed which a natural number doesn't support.

3. Set of whole numbers is the same as integers, so it can't be that.

4. None of the choices, which in my opinion is the correct one.

I'm not sure it is correct, but I hope I helped you!

7 0

1 year ago

Write the equation of a linear function that has a slope of ‒3 and a y-intercept of ‒2.

Len [333]

Answer:

y=-3x-2

Step-by-step explanation:

8 0

2 years ago

Please help it's due today. Also please don't help if you don't know.

zavuch27 [327]

Answer:

${x}^{16} {y}^{22}$

Step-by-step explanation:

multiple the top exponents by 3 and the u subtract the bottoms

4 0

2 years ago

HELP?!!!!! Name the space figure you can form from the net.

daser333 [38]

Answer:

a or b but i think a

Step-by-step explanation:

4 0

3 years ago

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