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kykrilka [37]
3 years ago
15

Is 225/15/3 equal to 225/(15/3)?

Mathematics
2 answers:
Andrej [43]3 years ago
8 0
No, because if they were equal the second equation should be 225/(15x3), not (15/3). 
storchak [24]3 years ago
3 0
No
For the first one, you would have to do 225/5 first bc of pemdas
in the second one, you do 15/3 first bc of pemdas
For the first one, you get 5, but for the second one, you get 45
hope this helps!!
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A study is done to find the 95% confidence interval for the difference in means between the ACT scores between two schools in a
Kitty [74]

Solution :

95% confidence interval for the difference between the means of ACT scores between two schools, is given by :

$[(\overline X_1 - \overline X_2)-ME, (\overline X_1 - \overline X_2)+ME]$

$\overline X_1 = 25.90 ,  \ \ \ \overline X_2 = 27.70$

$S_1=3.49, \ \ \ S_2 = 2.47$

$n_1=39, \ \  n_2=37$

M.E. , Margin of error,

$=t_{n_1+n_2-2,0.025} \times \left( s \sqrt{\frac{1}{n_1}+\frac{1}{n_2}}$

$s^2 = \frac{(n_1-1)S_1^2+(n_2-1)S^2_2}{n_1+n_2-2}$

  $=\frac{38(3.49)^2+36(2.47)^2}{39+37-2}$

 = 9.222

s = 3.03

$t_{74,0.05} = 1.99$

$M.E. = 1.99 \times 3.03 \times \sqrt{\frac{1}{39}+\frac{1}{37}}$

        = 1.4

Therefore, 95% CI = [(25.90-27.70) - 1.4 , (25.90-27.70) + 1.4]

                              = [-3.2, -0.4]

Therefore, the lower bound is -3.2

7 0
3 years ago
30<br> find the length of AB.<br> D 20 C<br> Show your work
vovikov84 [41]
You use Pythagoras theorem for this:
You add 52 and 20 for AC which is 72
So you do
X^2 = 72^2 + 30^2
X^2 =5184 + 900
X^2= 6084
X = 6084 squared root
X= 78
4 0
2 years ago
Saby used a probability simulator to roll a 6-sided number cube and flip a coin 100 times. The results are shown in the tables b
Degger [83]
Short Answers
P(Both) = 0.1792
Givens
The total number of roles = 100
Total number of heads = 56
Number of times rolled a four =  32 [check this for me].

Set up the probabilities.
P(H) = 56/100
P(4) = 32/100
P(H)*P(4) = P(Both)

Substitute and solve
P(Both) = 56/100 * 32/100 = 1792/10000
P(Both) = 112/625 because there are many cancellations. Or you could just express it as 0.1972

8 0
3 years ago
F
Vilka [71]
I think it should be F=45
3 0
3 years ago
How to find y in the equation y+2x=3 then graph the answer
Flauer [41]
Go on the graph look at the y axis and x axis go to the x axis look for 2 and put the point and then go to postive 3 and put a point and that’s your answer.
7 0
3 years ago
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