Step-by-step explanation:
it is shown in the above process.
hope you understand
The answer is B.
A adds commas in the wrong place, which changes the equation to c(5 - 4) = 11.
When it says that it needs to be cut, it means to divide. therefore, you divide the 30 foot pipe by 2/3. Dividing by 2/3 is the same as multiplying by 3/2. 30*30/2 would be the equation. Then you multiply 30 by 30. 90. Then you divide 90 by 2, which is 45.
we are given
![p=900-4t^2](https://tex.z-dn.net/?f=p%3D900-4t%5E2)
where
price p( in dollars) of a new smartphone
t is the number of months since January
now, we can solve for t
step-1:
Add both sides by 4t^2
![p+4t^2=900-4t^2+4t^2](https://tex.z-dn.net/?f=p%2B4t%5E2%3D900-4t%5E2%2B4t%5E2)
![p+4t^2=900](https://tex.z-dn.net/?f=p%2B4t%5E2%3D900)
step-2:
Subtract both sides by p
![p+4t^2-p=900-p](https://tex.z-dn.net/?f=p%2B4t%5E2-p%3D900-p)
![4t^2=900-p](https://tex.z-dn.net/?f=4t%5E2%3D900-p)
step-3:
divide both sides by 4
![\frac{4t^2}{4} =\frac{900-p}{4}](https://tex.z-dn.net/?f=%5Cfrac%7B4t%5E2%7D%7B4%7D%20%3D%5Cfrac%7B900-p%7D%7B4%7D)
![t^2=\frac{900-p}{4}](https://tex.z-dn.net/?f=t%5E2%3D%5Cfrac%7B900-p%7D%7B4%7D)
![t^2=225-0.25p](https://tex.z-dn.net/?f=t%5E2%3D225-0.25p)
step-4:
Take sqrt both sides
![\sqrt{t^2} =\sqrt{225-0.25p}](https://tex.z-dn.net/?f=%5Csqrt%7Bt%5E2%7D%20%3D%5Csqrt%7B225-0.25p%7D)
![t=\sqrt{225-0.25p}](https://tex.z-dn.net/?f=t%3D%5Csqrt%7B225-0.25p%7D)
so, we get
..............Answer
It is 6 for number 9 glad I could help