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babymother [125]
3 years ago
14

[Choose} PLEEASE HELP

Mathematics
2 answers:
matrenka [14]3 years ago
4 0

Answer:

experimental study

Step-by-step explanation:

observational study: no variable is controlled by researchers

experimental study: a variable is controlled by researchers

survey: a survey is similar to a poll

Mumz [18]3 years ago
4 0

Answer:

i think the second one

Step-by-step explanation:

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Rjp912 it should be 4m                       
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Evaluate the series 4 – 2 + 1 – 0.5 + 0.25 to S10. Round to the nearest hundredth.
aleksklad [387]
The initial term of this geometric series is 4, and the common ratio is -1/2. The sum is given by

S_{n}=a_{1}\dfrac{r^{n}-1}{r-1}\\\\S_{10}=4\cdot \dfrac{(-\frac{1}{2})^{10}-1}{-\frac{1}{2}-1}=4\cdot \dfrac{(\frac{1}{1024}-1)}{(-\frac{3}{2})}\\\\=\dfrac{8}{3}\cdot \dfrac{1023}{1024}=\dfrac{341}{128}

The sum is approximately 2.66.
4 0
3 years ago
Twice a certain whole number subtracted from 3 times the square of the number leaves 133. Find the number
user100 [1]

Answer:

7

Step-by-step explanation:

"a certain whole number" is a number that we don't know, so pick a variable, let's use n

"Twice" means two times, so we'll use 2n for this.

"subtracted from" means the 2n will be AFTER the minus sign.

____ - 2n

What goes in front? "3 times the square of the number" 3n^2

Now we have 3n^2 - 2n

Lastly, we see the result is 133. So this gives us:

3n^2 - 2n = 133 To solve, subtract 133 from both sides of the equation.

3n^2 -2n - 133 = 0 Next FACTOR.

(3n + 19)(n - 7) = 0

3n+19=0 and n-7=0

n=-19/3 and n=7

Since we are looking for a whole number choose n=7

6 0
3 years ago
Simplify the expression
AleksAgata [21]

4m + 5

Remove the parenthesis and collect like terms

3m + m + 5 = (3m + m) + 5 = 4m + 5


3 0
3 years ago
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