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3 years ago

8

At a school assembly four out of the first 10

1 answer:

Ilya [14]3 years ago

5 0

Answer:

125

Step-by-step explanation:

Well if 10 x 50 is 500 (just to show how you get doesn't affect problem) you would simply divide by 4 thus, you get 125 (edit: sorry if this is wrong I'm in my first year of middle lol)

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How do you find the system of equations for a graph?

pogonyaev

Answer:

The solution of such a system is the ordered pair that is a solution to both equations. To solve a system of linear equations graphically we graph both equations in the same coordinate system. The solution to the system will be in the point where the two lines intersect.

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

assume x and y are both differentiable functions of t. find dx/dt given x=-1 and dy/dt=8 for the relation: 4x^2+3y^3=28

melomori [17]

Given:

x and y are both differentiable functions of t.

$4x^2+3y^3=28$

$x=-1\text{ and }\dfrac{dy}{dt}=8$

To find:

The value of $\dfrac{dx}{dt}$ .

Solution:

We have,

$4x^2+3y^3=28$ ...(i)

At x=-1,

$4(-1)^2+3y^3=28$

$4+3y^3=28$

$3y^3=28-4$

$3y^3=24$

Divide both sides by 3.

$y^3=8$

Taking cube root on both sides.

$y=2$

So, y=2 at x=-1.

Differentiate (i) with respect to t.

$4(2x\dfrac{dx}{dt})+3(3y^2\dfrac{dy}{dt})=0$

Putting x=-1, y=2 and $\dfrac{dy}{dt}=8$ , we get

$4(2(-1)\dfrac{dx}{dt})+3(3(2)^28)=0$

$-8\dfrac{dx}{dt}+9(4)(8)=0$

$-8(\dfrac{dx}{dt}-9(4))=0$

Divide both sides by -8.

$\dfrac{dx}{dt}-36=0$

$\dfrac{dx}{dt}=36$

Therefore, the value of $4x^2+3y^3=28$ is 36.

6 0

3 years ago

Find 20% of 55.

mash [69]

1) 55/100 * 20 = 11
2) 200/100 * 12 = 24
3) 756/100 * 42 = 317.52 = 320
4) 460/100 * 11 = 50.6

5 0

3 years ago

2. How much water could my well hold if the depth of the well is 30ft and the diameter of the well is 24ft?

Ann [662]

Answer:

$V=4,320\pi\ ft^{3}$ or $V=13,564.8\ ft^{3}$

Step-by-step explanation:

we know that

The volume of the cylinder (the well) is equal to

$V=\pi r^{2} h$

where

$r=24/2=12\ ft$ ----> the radius is half the diameter

$h=30\ ft$

substitute

$V=\pi (12)^{2}(30)$

$V=4,320\pi\ ft^{3}$

assume

$\pi =3.14$

$V=4,320(3.14)=13,564.8\ ft^{3}$

5 0

3 years ago

Read 2 more answers

If it is 85°C in California and -4°C is Nebraska, how many degrees warmer is it in California? Explain how

Alinara [238K]

Answer:

89°C

Step-by-step explanation:

I think it is just a case of subtraction. Remove the °C and just treat it as 85 - -4

5 0

2 years ago

Read 2 more answers