Ask question

Ask question

All categories

2 years ago

9

Please tell me the right answer

1 answer:

Alexus [3.1K]2 years ago

6 0

Answer:

is probably y=-2x

Step-by-step explanation:

You might be interested in

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

Solve for x. Please help me.

mr_godi [17]

X=15 this is because 45+15 is equal to 60 and is equal to 4x so 4x=60 divide both sides by 4 to get x and you get x is equal to 15

6 0

3 years ago

Read 2 more answers

Dana painted a wall in her bedroom that is 10.5 feet tall and 23.5 feet wide. She used exactly 3 quarts of paint to cover the wa

Alenkasestr [34]

Multiply 10.5 and 23.5 to get 246.75. Divide that by 3 and you have your answer, 82.25.

6 0

3 years ago

GenaCL600 [577]

The correct answer is b.

6 0

3 years ago

Read 2 more answers

I just need to know what to do when I have this <br>-4ac <br>and I know what a and c are <br>

Svetradugi [14.3K]

Answer:

you have to multiply them

-4×a×c

also they're called unknown numbers

3 0

2 years ago