A rectangle has an area of 42 cm²; the length is 7 cm. Find its width.

Mathematics

1 answer:

liubo4ka [24]3 years ago

7 0

You would have 6cm as the width because length times width = area

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2 years ago

Solve for this equation<br> z^2-12z=-13

ASHA 777 [7]

Answer:

$z=\sqrt{-1}$

Step-by-step explanation:

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Rewrite this equation in standard form.<br> 11x + 10x^ = 6

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Answer:

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Step-by-step explanation:

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3 years ago

Find domain of y=rad20-6x

Evgesh-ka [11]

Domain, on an "even root" context, means, an even root cannot have a negative radicand, since say for example $\bf \sqrt{-25}\ne -5\qquad why?\implies (-5)(-5)=25$

so... you end up with an "imaginary value"

so... for the case of 20-6x
"x", the domain, or INPUT
can afford to have any value, so long it doesn't make the radicand negative

to check for that, let us make the expression to 0, and see what is "x" then

$\bf 20-6x=0\implies 20=6x\implies \cfrac{20}{6}=x\implies \cfrac{10}{3}=x$

now, if "x" is 10/3, let's see $\bf \sqrt{20-6\left( \frac{10}{3} \right)}\implies \sqrt{20-20}\implies \sqrt{0}\implies 0$

now, 0 is not negative, so the radicand is golden

BUT, if "x" has a value higher than 10/3, the radicand turns negative
for example $\bf x=\frac{11}{3}
\\\\\\

\sqrt{20-6\left( \frac{11}{3} \right)}\implies \sqrt{20-22}\implies \sqrt{-2}$

so.. that's not a good value for "x"

thus, the domain, or values "x" can safely take on, are all real numbers from 10/3 onwards, or to infinity if you wish

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3 years ago

Which expression is equivalent to 13 - -21

Ber [7]

13 + 21 = 13- -21

The minus sign and negative cancel each other out.

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3 years ago