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3 years ago

jane and jill were simplifying the expression (2x2+x) +2(-x2+×) and obtained different answers . who is right and why?

Mathematics

1 answer:

Romashka [77]3 years ago

4 0

Answer: who ever arrives at the answer x=0/3 =0 is correct

Step-by-step explanation:

Even though I need supporting details from the individual answers of Jane and Jill to pass my own judgment.

Given the expression

(2x²+x) +2(-x²+×)=0

Let's us open the bracket

2x²+x-2x²+2x=0

Collecting like terms

2x²-2x²+x+2x=0

3x=0

x=0/3

x=0

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3 years ago

Consider the figure below. Write the equation of the line of reflection. <br>_____ = ______<br>

PolarNik [594]

Answer:

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Step-by-step explanation:

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2 years ago

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3 years ago

Need help please <br> find the area of the shape below

Tanzania [10]

Answer:

$198.5\ cm^2$

Step-by-step explanation:

Break the figure in three parts as shown in the image I attached.

The figure makes 2 semi circles and 1 rectangle so,

Area of rectangle = Length x breadth

Area of rectangle = 12 x 10

Area of rectangle = 120

Now for the semi circles , we have 2 semi-circles which means area of both semi circles would be

Area of semi circle = $\frac{1}{2} \pi r^2\\$

so, Area of two semi circles would be = $(\frac{1}{2} \pi r^2)2$

so, Area of two semi circles would be = $\pi r^2$

now for the radius we know that,

Diameter = 2 x radius

D = 2r

and the diameter is 10cm so,

10 = 2r

10/2 = r

r = 5cm

so we put r = 5 in the formula ,

$Area\ of\ two\ semi\ circles\ = \pi r^2\\Area\ of\ two\ semi\ circles\ =\pi (5)^2\\Area\ of\ two\ semi\ circles\ =25\pi \\Area\ of\ two\ semi\ circles\ =78.5\ cm^2$

So now the total area of the figure is

Total Area = Area of rectangle + Area of two semi circles

Total Area = 120 + 78.5

Total Area = 198.5 cm^2

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3 years ago

Plz help me step by step

dybincka [34]

Answer:

x = - 6

Step-by-step explanation:

Equation

1/3 * (-9x +12) = 22 Multiply both sides by 3

Solution

3 * 1/3(-9x + 12) = 22*3

- 9x + 12 = 66 Subtract 12 from both sides.

-9x = 66 - 12 Combine

-9x = 54 Divide by -9

x = 54/-9

x = - 6

6 0

3 years ago

jane and jill were simplifying the expression (2x2+x) +2(-x2+×) and obtained different answers . who is right and why?​

jane and jill were simplifying the expression (2x2+x) +2(-x2+×) and obtained different answers . who is right and why?