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3 years ago

Letty answered 15 out of 20 questions correctly on her history quiz. What is her grade as a percent?

Mathematics

2 answers:

andriy [413]3 years ago

8 0

Answer:

Letty has 75%

Step-by-step explanation:

15/20 is the same as 75/100 ( 15/20·5) so she has a 75% grade

grin007 [14]3 years ago

6 0

Answer: 75%

Step-by-step explanation:

you can do 15 over 20 or 15 divided by 20 which will give you .75

move the decimal to the right two times and you get 75%

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Now, rationalize a denominator means that you have to get rid of the square root, in order to have an integer denominator.

To do so, remember that you can always multiply any number by 1 without changing its value, and you can always think of 1 as a fraction where numerator and denominator are equal:

$\dfrac{2}{7\sqrt{2}} = \dfrac{2}{7\sqrt{2}}\cdot 1 = \dfrac{2}{7\sqrt{2}} \cdot \dfrac{\sqrt{2}}{\sqrt{2}} = \dfrac{2\sqrt{2}}{7\cdot 2} = \dfrac{\sqrt{2}}{7}$

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