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Lesechka [4]
2 years ago
5

Find the following a) 3/4 of 28

Mathematics
2 answers:
SCORPION-xisa [38]2 years ago
6 0

Answer:

21

Step-by-step explanation:

(3÷4)×(28)=

Otrada [13]2 years ago
5 0

the answer is 21

tell me if its right and i hope it helps

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A tree casts a shadow that is 20 feet in length. if the angle of elevation is 32 degrees, which of the following best represents
swat32
The answer woudl be d

7 0
3 years ago
Read 2 more answers
In the past decades there have been intensive antismoking campaigns sponsored by both federal and private agencies. In one study
DIA [1.3K]

Answer:

z=\frac{0.384-0.362}{\sqrt{0.374(1-0.374)(\frac{1}{4276}+\frac{1}{3908})}}=2.055    

The p value can be calculated from the alternative hypothesis with this probability:

p_v =2*P(Z>2.055)=0.0399    

And the best option for this case would be:

C. between 0.01 and 0.05.

Step-by-step explanation:

Information provided

X_{1}=1642 represent the number of smokers from the sample in 1995

X_{2}=1415 represent the number of smokers from the sample in 2010

n_{1}=4276 sample from 1995

n_{2}=3908 sample from 2010  

p_{1}=\frac{1642}{4276}=0.384 represent the proportion of smokers from the sample in 1995

p_{2}=\frac{1415}{3908}=0.362 represent the proportion of smokers from the sample in 2010

\hat p represent the pooled estimate of p

z would represent the statistic    

p_v represent the value for the pvalue

System of hypothesis

We want to test the equality of the proportion of smokers and the system of hypothesis are:    

Null hypothesis:p_{1} = p_{2}    

Alternative hypothesis:p_{1} \neq p_{2}    

The statistic is given by:

z=\frac{p_{1}-p_{2}}{\sqrt{\hat p (1-\hat p)(\frac{1}{n_{1}}+\frac{1}{n_{2}})}}   (1)  

Where \hat p=\frac{X_{1}+X_{2}}{n_{1}+n_{2}}=\frac{1642+1415}{4276+3908}=0.374  

Replacing the info given we got:

z=\frac{0.384-0.362}{\sqrt{0.374(1-0.374)(\frac{1}{4276}+\frac{1}{3908})}}=2.055    

The p value can be calculated from the alternative hypothesis with this probability:

p_v =2*P(Z>2.055)=0.0399    

And the best option for this case would be:

C. between 0.01 and 0.05.

7 0
2 years ago
Tanya runs a catering business. Based on her records, her weekly profit can be approximated by the function LaTeX: f\left(x\righ
Shtirlitz [24]

The function

2x^2-44x-150

is a parabola concave up, whose solutions are

2x^2-44x-150=0 \iff x^2-22x-75=0

from here, you can use the quadratic formula

x_{1,2} = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}

to find that the solutions of the parabola are -3,\ 25

So, the parabola is positive if x (which wouldn't make sense in our case) or x

So, if Tanya caters 25 meals she breaks even, and starting with the 26th meal she will begin to profit.

4 0
3 years ago
Which numbers are in order from least to greatest?
mixas84 [53]

Answer:

D

Step-by-step explanation:

5 0
3 years ago
9x+18+3x=1
Katen [24]
The error is in the second step they subtracted 3 from both sides but it was a 3x, which you can not do.
Correction.
9x+18+3x=1
12x+18=1
12x=-17
x=-17/12
3 0
2 years ago
Read 2 more answers
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