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2 years ago

Please help!!!!!!! Will mark brainliest

Mathematics

1 answer:

netineya [11]2 years ago

7 0

Answer:

$\displaystyle 5$

Step-by-step explanation:

$\displaystyle ±7 = \sqrt{49} \\ \\ -7 = x + 2\:\:AND\:\:7 = x + 2 \\ \\ -9, 5 = x$

Sinse you want the POSITIVE solution, your answer is 5.

I am joyous to assist you at any time.

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2 years ago

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If the volume of a cube is 216cm fond the length of the cube

deff fn [24]

Answer:

6cm

Step-by-step explanation:

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2 years ago

Find the value for x. Round your answer to the nearest hundredth. Area of the triangle = 8 ft^2

zmey [24]

Answer:

x = 3.51

Step-by-step explanation:

Since, formula to determine the area f a triangle is,

Area = $\frac{1}{2}(\text{Base})(\text{Height})$

8 = $\frac{1}{2}(x + 1)(3x - 7)$

16 = x(3x - 7) + 1(3x - 7)

16 = 3x² - 7x + 3x - 7

16 = 3x² - 4x - 7

0 = 3x² - 4x - 23

3x²- 4x - 23 = 0

By quadratic formula,

x = $\frac{-b\pm \sqrt{b^{2}-4ac}}{2a}$

x = $\frac{4\pm \sqrt{(-4)^{2}-4(3)(-23)}}{2(3)}$

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x = $\frac{4\pm 17.09}{6}$

x = 3.51, -2.18

But the length of sides can't be negative.

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8 0

2 years ago

Find the equation of the exponential function represented by the table below:

IgorC [24]

Answer:

$y=2^{1-x}$

Step-by-step explanation:

<u>Exponential Function</u>

When we need to express the exponential relation between two variables, we use the equation

$y=Cr^{x}$

where C, r are constants to be determined by using the given points from the table

For x=0, y=2, thus

$2=C.r^{0}=C$

We find that C=2

The equation is now

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Now we use the point x=1, y=1

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Thus, the equation is

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Rearranging

$y=2(2)^{-x}=2^{1-x}$

The required equation is

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We can easily verify the last two points are also obtained by using the equation

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2 years ago

What is <br>y=3x-4and y=x-2

IrinaVladis [17]

Answer:

x= 1

y= -1

Hope this helps!

Step-by-step explanation:

1 Substitute y=3x−4 into y=x-2

3x-4=x-2

2 Solve for x in 3x-4=x-2

x=1

3 Substitute x=1 into y=3x-4

y=-1

4 Therefore,

x=1

y=-1

3 0

2 years ago