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3 years ago

I need help with this math problem.

Mathematics

1 answer:

Nostrana [21]3 years ago

8 0

Step- Theby-step explanation:The answer is 21/2

This is the step:

(x-8)/5=2/4,then you can get (x-8)=(2/4) multiply by 5

(x-8)=10/4=5/2

x=(5/2)+8

x=21/2

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Solve the inequality <br> 2x-1/x > 1

Grace [21]

Answer:

− 1 /2 < x < 0

or x > 1

Step-by-step explanation:

Solve the inequality by finding the roots and creating test intervals.

Glad I could help!!

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3 years ago

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Given a rectangle with an area of 20 square units, if the width is x units and the length is x + 1 units, what is the difference

ollegr [7]

Answer: 1unit.

Step-by-step explanation:

Area of the rectangle

A = length × width

Since the area = 20 and the width is x and the length is x + 1.

We now substitute for the values in the above formula and solve for x

20 = x × x + 1

20 = x( x + 1 ), we now open

20 = x² + x , then re arrange.

x² + x - 20 = 0, this is a quadratic equation.we solve for x using quadratic means

Here, I am going to solve using factorization by grouping

x² + x - 20 = 0

x² + 5x - 4x - 20 = 0

x( x + 5 ) - 4( x + 5 ) = 0

( x + 5 )( x - 4 ). = 0

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x = -5 or 4, but x can not be -5 ( negative), so x = 4.

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5 0

4 years ago

If 120 marks is 60% what is full marks

AveGali [126]

Let's say is "x", so, then "x" is the 100%, and we know that the 60% is 120, what the dickens is "x" anyway?

$\bf \begin{array}{ccll}
marks&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
x&100\\
120&60
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3 years ago

The radius of the base of a cylinder is decreasing at a rate of 121212 kilometers per second. The height of the cylinder is fixe

WARRIOR [948]

Answer:

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Step-by-step explanation:

Given that:

Rate of decreasing of radius = 12 km/sec

Height of cylinder is fixed at = 2.5 km

Radius of cylinder = 40 km

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The rate of change of Volume of the cylinder?

Solution:

First of all, let us have a look at the formula for volume of a cylinder.

$Volume = \pi r^2h$

Where $r$ is the radius and

$h$ is the height of cylinder.

As per question statement:

$r$ = 40 km (variable)

$h$ = 2.5 (constant)

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As $\pi, h$ are constant:

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3 years ago

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