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3 years ago

A teacher recommends that students read for 20 minuets each night

Mathematics

1 answer:

Alex777 [14]3 years ago

7 0

They will improve their vocabulary and improve their brain skills to figure out what they want to know.

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A 1.5-meter snake lives in the ceiling of a college’s Chemistry Building. One day, she decides to go outside, and slithers throu

lubasha [3.4K]

Answer:

$The~answer~for~this~question~is:135,000$

Step-by-step explanation:

→ $It's~quite~simple~actually.~Here~let~me~show~you:$

$15$ × $90=1350$

→ $Now,~we~take~1350~and~multiply~it~with~100:$

$1350$ × $100=135,000$

$Easy~isn't?~Hope~this~helped!$

7 0

3 years ago

a local company uses 13 1/2 tons of paper in one week. It recycles about 1/3 of its waste. how many tons of paper does the compa

bogdanovich [222]

Answer:

4 1/2 tons of recycled paper

Step-by-step explanation:

13.5/3 = 4.5 or 4 1/2

3 0

2 years ago

(23.01) In a randomized comparative experiment on the effect of dietary calcium on blood pressure, researchers divided 58 health

Paul [167]

Answer:

$113.7-2.154\frac{9.1}{\sqrt{29}}=110.06$

$113.7+2.154\frac{9.1}{\sqrt{29}}=117.34$

And the 96% confidence is given by (110.06; 117.34)

Step-by-step explanation:

Information given

$\bar X=113.7$ represent the sample mean

$\mu$ population mean (variable of interest)

s=9.1 represent the sample standard deviation

n=29 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom are given by:

$df=n-1=29-1=28$

The Confidence is 0.96 or 96%, the significance is $\alpha=0.04$ and $\alpha/2 =0.02$ , and the critical value would be $t_{\alpha/2}=2.154$

Replacing the info we got:

$113.7-2.154\frac{9.1}{\sqrt{29}}=110.06$

$113.7+2.154\frac{9.1}{\sqrt{29}}=117.34$

And the 96% confidence is given by (110.06; 117.34)

5 0

3 years ago

The sum of two number is 17. their driffrence is 27.write a system of equations that describe this situation. solve to find the

STatiana [176]

A) x + y = 17
B) x - y = 27
Adding both equations:2x = 44
x = 22
y = -5

6 0

3 years ago

Y = x^2 + 6x + 4<br><br>Find the vertex<br>And please explain how I don't understand.

Bond [772]

Answer:

(-3, -5) This is my answer I hope it helps

3 0

3 years ago