3 years ago

Kim spent 1/5 of her money at the mall. What percent of Kim’s money was spent at the mall?

Mathematics

1 answer:

wariber [46]3 years ago

7 0

Answer:

20%

Step-by-step explanation:

1/5 × 100 = 20%

Note: to change ANY fractions to percentage form, multiply with 100

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Use completing the square to determine which of the following gives the solutions to 3x2 - 24x + 40 = 28.

jeka94

Answer:

$x=4+2\sqrt{3}$

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Step-by-step explanation:

<u>Completing the square</u>

when $ax^2+bx+c=0$

Given equation:

$3x^2-24x+40=28$

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$\implies x^2-8x=-4$

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Square root both sides:

$\implies x-4=\pm\sqrt{12}$

Add 4 to both sides and simplify the radical:

$\implies x=4\pm\sqrt{4 \cdot 3}$

$\implies x=4\pm\sqrt{4}\sqrt{3}$

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Step-by-step explanation:

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