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goldenfox [79]
3 years ago
9

A shirt cost $20 .the sale tax is 5%.how much is the sales tax what is her total cost for the shirt

Mathematics
2 answers:
ale4655 [162]3 years ago
5 0
20 x.05 = 1
20 + 1 = $21
olga55 [171]3 years ago
3 0
_Brainliest if Helped!!

Sales Tax : 5% of $20 , 5/100 * 20 = $1  
Total Cost : Original Price + sales tax=  $20 + $1 =$21
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Step-by-step explanation:

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The equation
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<h2>Explanation:</h2>

Let's use a trial and improvement method to find this solution.

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Substituting into the equation:

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Step 2. Let's choose x = 8.4

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Step 3. Let's choose x = 8.3

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Water is drained out of tank, shaped as an inverted right circular cone that has a radius of 4cm and a height of 16cm, at the ra
bearhunter [10]

Answer:

\frac{dh}{dt}=-\frac{1}{2\pi}cm/min

Step-by-step explanation:

From similar triangles, see diagram in attachment

\frac{r}{4}=\frac{h}{16}


We solve for r to obtain,


r=\frac{h}{4}


The formula for calculating the volume of a cone is

V=\frac{1}{3}\pi r^2h


We substitute the value of r=\frac{h}{4} to obtain,


V=\frac{1}{3}\pi (\frac{h}{4})^2h


This implies that,

V=\frac{1}{48}\pi h^3


We now differentiate both sides with respect to t to get,

\frac{dV}{dt}=\frac{\pi}{16}h^2 \frac{dh}{dt}


We were given that water is drained out of the tank at a rate of 2cm^3/min


This implies that \frac{dV}{dt}=-2cm^3/min.


Since we want to determine the rate at which the depth of the water is changing at the instance when the water in the tank is 8cm deep, it means h=8cm.


We substitute this values to obtain,


-2=\frac{\pi}{16}(8)^2 \frac{dh}{dt}


\Rightarrow -2=4\pi \frac{dh}{dt}


\Rightarrow -1=2\pi \frac{dh}{dt}


\frac{dh}{dt}=-\frac{1}{2\pi}






3 0
3 years ago
Read 2 more answers
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