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2 years ago

Find the approximate area of a circle that has a radius of 14 feet. Round your answer to the nearest hundredth.

Mathematics

2 answers:

ololo11 [35]2 years ago

3 0

A=PIEr^2, letting r=14

a=PIE(14)^2

=615.75ft^2

use the symbol pie as the substitution for the actual word

viva [34]2 years ago

3 0

Answer:

615.75

Step-by-step explanation:

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2 years ago

If 7/x + 8/y = 2; 2/x + 12/y = 20, then x = ?

kvv77 [185]

Answer:

<h3><u>Given Question</u></h3>

$\sf \: \dfrac{7}{x} + \dfrac{8}{y} = 2, \: \dfrac{2}{x} + \dfrac{12}{y} = 20, \: then \: x \: = \:$

$\green{\large\underline{\sf{Solution-}}}$

Given pair of equations are

$\rm :\longmapsto\:\dfrac{7}{x} + \dfrac{8}{y} = 2 - - - - (1)$

and

$\rm :\longmapsto\:\dfrac{2}{x} + \dfrac{12}{y} = 20$

On dividing by 2, we get

$\rm :\longmapsto\:\dfrac{1}{x} + \dfrac{6}{y} = 10 - - - - (2)$

On multiply equation (1) by 3 and (2) by 4, we get

$\rm :\longmapsto\:\dfrac{21}{x} + \dfrac{24}{y} = 6 - - - - (3)$

and

$\rm :\longmapsto\:\dfrac{4}{x} + \dfrac{24}{y} = 40 - - - - (4)$

On Subtracting equation (3) from (4), we get

$\rm :\longmapsto\: - \dfrac{17}{x} = 34$

$\rm :\longmapsto\: - \dfrac{17}{34} = x$

$\bf\implies \:x \: = \: - \: \dfrac{1}{2}$

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<h3><u>Concept Used :- </u></h3>

There are 4 methods to solve this type of pair of linear equations.

1. Method of Substitution

2. Method of Eliminations

3. Method of Cross Multiplication

4. Graphical Method

We prefer here Method of Eliminations :-

To solve systems using elimination, follow this procedure:

<h3><u>The Elimination Method</u></h3>

Step 1: Multiply each equation by a suitable number so that the two equations have the same leading coefficient.

Step 2: Subtract the second equation from the first to eliminate one variable

Step 3: Solve this new equation for other variable.

Step 4: Substitute the value of variable thus evaluated into either Equation 1 or Equation 2 and get the value other variable.

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2 years ago