MATHEMATICS MIDDLE SCHOOL

Calculate the discriminant x2-2x+4=0
A.0

B.20

C.12

D.-12

Answers

Answer 1
Answer: ax^2+bx+c=0\nthe\ discriminant:\Delta=b^2-4ac\n-------------------\nYour\ example:\nx^2-2x+4=0\to a=1;\ b=-2;\ c=4\n\nthereore\ \Delta=(-2)^2-4\cdot1\cdot4=4-16=\fbox{-12}\n\nAnswer:\boxed{D.\ -12}
Answer 2
Answer: x^2-2x+4=0 \n \na=1 \nb=-2 \nc=4 \n \n\hbox{the discriminant: } \Delta=b^2-4ac=(-2)^2 - 4 *1 * 4=4-16=-12

The answer is D.

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2 times 2 times 13 what is the missing number?

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52 is the missing number

A right prism has a base that is an equilateral triangle. The height of the prism is equal to the height of the base. If the volume of the prism is 81, what are the lengths of the sides of the base?

Answers

Answer:

Lengths of the sides (there are 3 sides in an equilateral triangle) of the base of prism is5.72cm each.

Step-by-step explanation:

As the base of triangular prism is equilateral:

∴ Area of base = (√ 3 / 4)× (side)²

According to question:

height of prism = height (side) of base

Volume of prism = 81 cm³,

∴ Volume of prism = Area of base x height

⇒  81 cm³ = (√ 3 / 4)× (side)² × height       ∵ side = height

⇒   81 cm³ = (√ 3 / 4)× (side)³

⇒  81 × (4/√3) cm³ = side³    

⇒  ∛(81 × (4/√3) cm = side

⇒  side = 5.72cm

WILL BE MARKED BRAINLIEST!!!!
x-y=4
How do you get the y alone?

Answers

The answer is y = x-4.

Step-by-step explanation:

  • The given expression is x-y=4
  • Keep y alone on one side and move remaining terms to the other side.

⇒ -y = 4-x

  • To have y alone, Multiply the above expression with -ve sign on both sides.

⇒ y = x-4

I am homeschooled and am in 7th grade can someone please get answers to the pattern and rules unit test 7th grade please

Answers

What is the 7th grade unit pattern rule question.

                                           

How do I do this?? Help!

Answers

Hi there!

In order to use the elimination method, you have to create one variable that has the same coefficient. This is to be able to eliminate one variable and have a one variable equation (which you can then solve).

In your case, we'll have the "x" have the same coefficient by multiplying the top equation by 4 and the bottom equation by 2 :

4( -2x + 3y = -4) → -8x + 12y = -16

2( 4x - 2y = 16) → 8x - 4y = 32


Now that both of your equation have a variable with the same coefficient, you need to choose rather you need to add or subtract the equations in order to get rid of the variable (in this case we want to get rid of the "x").

In your case, you want to add both equation together which will give you :

8y = 16


Now that you only have one variable, all you need to do now is solve the equation for "y" :

8y = 16

Divide each side of the equation by 8

y = 2 → Your answer


There you go! I really hope this helped, if there's anything just let me know! :)
This is how I did it.

Which is longer 1/3 of a minute or 2/3 of a minute?

Answers

2/3 of a minute is longer than 1/3 of a minute
2/3 of a minute, because 2/3 is greater than 1/3.
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