Answer:
c) 2.0 g/cm³
Step-by-step explanation:
The units of density (g/cm³) tell you to divide the mass by the volume.
... (18 g)/(9.0 cm³) = (18/9.0) g/cm² = 2.0 g/cm³
"Six less"=-6
"four times a number"=4n
"is 50"= =50
4n-6=50 add 6 to both sides
4n=56 divide both sides by 4
n=14
So, wrong on very first line...line one should have been: 4n-6=50
The surface area of a cube is 6 * sidelength^2
54 = 6 * sidelength^2
9 = sidelength^2
3 = sidelength
Answer:
See proof below.
Step-by-step explanation:
If we assume the following linear model:
And if we have n sets of paired observations 
the model can be written like this:
And using the least squares procedure gives to us the following least squares estimates 
for 
and 
for 
:
Where:
Then 
is a random variable and the estimated value is 
. We can express this estimator like this:
Where 
and if we see careful we notice that 
and 
So then when we find the expected value we got:
And as we can see is an unbiased estimator for
In order to find the variance for the estimator we have this:
And we can assume that 
since the observations are assumed independent, then we have this:
And if we simplify we got:
And with this we complete the proof required.
Answer: 3
Step by step explanation: If there are 60 kids and 25% of them went to Floridia, then 1/4 of them went to Floridia, which is 15 (Bc 60/4=15). If 20% of them went to NY, then that’s 1/5 if the the kids, which is 12 (Bc 60/5=12). Finally, you just subtract 15 from 12 and get 3. Hope that helps!
