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3 years ago

a random sample of seventh graders shows the numbers of minutes they spend on personal hygiene each morning

Mathematics

2 answers:

Gre4nikov [31]3 years ago

5 0

Answer:

Step-by-step explanation:

u expect us to know the questions

IRINA_888 [86]3 years ago

3 0

Can you post the rest of the question

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Garcia's bike rentals it costs $28 to rent a bike for 5 hours. How many dollars does it cost per hour of bike use?

lapo4ka [179]

Answer:

$5.60 dollars an hour

Step-by-step explanation:

You have to divided 28 by 5 and if you want to check it the number 5.6 and times it by 5.

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3 years ago

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Can someone help me with these? Thank you so much!

Genrish500 [490]

Answer:

I believe the first question is the third option. I hope this helps!

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3 years ago

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What is the quotient of the expression: 12/-3

4vir4ik [10]

Answer:

-4

Step-by-step explanation:

trust me im smart

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3 years ago

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Use the discriminant to determine what type of roots the equations will have, and categorize the equations according to their ro

topjm [15]

Step-by-step explanation:

The discriminant of the quadratic equation $ax^2+bx+c=0$ :

$\Delta=b^2-4ac$

If Δ < 0, then the equation has two complex roots $x=\dfrac{-b\pm\sqrt\Delta}{2a}$

If Δ = 0, then the equation has one repeated root $x=\dfrac{-b}{2a}[/tex If Δ > 0, then the equation has two discint roots [tex]x=\dfrac{-b\pm\sqrt\Delta}{2a}$

$1.\ x^2-4x+2=0\\\\a=1,\ b=-4,\ c=2\\\\\Delta=(-4)^2-4(1)(2)=16-8=8>0,\ \bold{two\ distinct\ roots}\\\sqrt\Delta=\sqrt8=\sqrt{4\cdot2}=2\sqrt2\\\\x=\dfrac{-(-4)\pm2\sqrt2}{2(1)}=\dfrac{4\pm2\sqrt2}{2}=2\pm\sqrt2\\\\==============================\\\\2.\ 5x^2-2x+3=0\\\\a=5,\ b=-2,\ c=3\\\\\Delta=(-2)^2-4(5)(3)=4-60=-56$

$3.\ 2x^2+x-6=0\\\\a=2,\ b=1,\ c=-6\\\\\Delta=1^2-4(2)(-6)=1+48=49>0,\ \bold{two\ distinct\ roots}\\\sqrt\Delta=\sqrt{49}=7\\\\x=\dfrac{-1\pm7}{(2)(2)}\\\\x_1=\dfrac{-8}{4}=-2,\ x_2=\dfrac{6}{4}=\dfrac{3}{2}\\\\==============================\\\\4.\ 13x^2-4=0\qquad\text{add 4 to both sides}\\\\13x^2=4\qquad\text{divide both sides by 13}\\\\x^2=\dfrac{4}{13}\to x=\pm\sqrt{\dfrac{4}{13}},\ \bold{two\ distinct\ roots}\\\\==============================$

$5.\ x^2-6x+16=0\\\\a=1,\ b=-6,\ c=16\\\\\Delta=(-6)^2-4(1)(16)=36-64=-28$

$7.\ 4x^2+11=0\qquad\text{subtract 11 from both sides}\\\\4x^2=-11\qquad\text{divide both sides by 4}\\\\x^2=-\dfrac{11}{4}\to x=\pm\sqrt{-\dfrac{11}{4}}\\\\x=\pm\dfrac{\sqrt{11}}{2}\ i,\ \bold{two\ complex\ roots}$

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3 years ago

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Write an algebraic rule to describe the translation C(5, –4)- ’(–2, 1).

Orlov [11]

A negative minus a negative is always a positive ;)

5 0

3 years ago