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3 years ago

Hand Sanitizer question

Mathematics

2 answers:

SpyIntel [72]3 years ago

6 0

Answer:

the first one

Step-by-step explanation:

statuscvo [17]3 years ago

6 0

Answer:

✔ The study uses a repeated measures design.

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100 points

mylen [45]

Answer:127

all you do is subtract -70 by 57 and it will give you a negative but get rid of it and you get 127 or just take the - away from -70 and add 57

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2 years ago

Which expression fits the description

inessss [21]

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3 years ago

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This table represents Mindy's check register. Her checking account had a balance of $647.60 on November 20.

Andreas93 [3]

Answer:

910.94

i got it right

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2 years ago

Find the area of this circle. Use 3.14 for pie?

pshichka [43]

Answer:

3.141592658

Step-by-step explanation:

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2 years ago

When the sum of \, 528 \, and three times a positive number is subtracted from the square of the number, the result is \, 120. F

aleksandr82 [10.1K]

Let $x$ be the unknown number. So, three times that number means $3x$ , and the square of the number is $x^2$

We have to sum 528 and three times the number, so we have $528+3x$

Then, we have to subtract this number from $x^2$ , so we have

$x^2-(3x+528)$

The result is 120, so the equation is

$x^2 - 3x - 528 = 120 \iff x^2 - 3x - 648 = 0$

This is a quadratic equation, i.e. an equation like $ax^2+bx+c=0$ . These equation can be solved - assuming they have a solution - with the following formula

$x_{1,2} = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$

If you plug the values from your equation, you have

$x_{1,2} = \dfrac{3\pm\sqrt{9-4\cdot(-648)}}{2} = \dfrac{3\pm\sqrt{9+2592}}{2} = \dfrac{3\pm\sqrt{2601}}{2} = \dfrac{3\pm51}{2}$

So, the two solutions would be

$x = \dfrac{3+51}{2} = \dfrac{54}{2} = 27$

$x = \dfrac{3-51}{2} = \dfrac{-48}{2} = -24$

But we know that x is positive, so we only accept the solution $x = 27$

6 0

3 years ago

Hand Sanitizer question​

Hand Sanitizer question