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4 years ago

Use mental math to find a solution for 2 over eight= 3over x+2

Mathematics

2 answers:

nataly862011 [7]4 years ago

7 0

X=10

2/8=3/x+2

1/4=3/x+2

X+2=12

X=10

Brainliest?

-Dominant- [34]4 years ago

5 0

The Answer: x= −12/7

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Find the area of the figure in the image attached. Round to the nearest tenth if necessary.

tatyana61 [14]

Answer: 15in^2

Step-by-step explanation:

first you need to find the area of the rectangle, so you would multiply 7 and 3, which gives you 21, (A=L•W). So now you need to find the area of the triangles, the formula for that is A= 1/2 b•h, so you get 3in for the area of the triangle, but since there are two and they are the exact same triangle you would just combine them, so the area for both triangles is 6in, so then you would need to subtract the 6 from the 21 so that you can find the area of the shape, and your final answer would be 15in(squared). hopefully you understand

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3 years ago

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X^2-8x+16=5 what are the solutions?

svp [43]

Hey!

The first step to solving this equation would be to subtract 5 from both sides of the equation.

Original Equation :
$x^{2}$ - 8x + 16 = 5

New Equation {Added Subtract 5 to Both Sides} :
$x^{2}$ - 8x + 16 - 5 = 5 - 5

Now we solve our new equation.

Old Equation :
$x^{2}$ - 8x + 16 - 5 = 5 - 5

Solution {Old Equation Solved} :
$x^{2}$ - 8x + 11 = 0

The next step would be to solve with the quadratic formula.

Quadratic Equation ( 1 ) :
$x = \frac{-(-8) + \sqrt{(-8)^{2} -4 * 1 * 11 } }{2*1}$

Quadratic Equation ( 1 ) {Solved} :
4 + $\sqrt{5}$

Quadratic Equation ( 2 ) :
$x = \frac{-(-8) - \sqrt{(-8)^{2}-4 *1*11 } }{2*1}$

Quadratic Equation ( 2 ) {Solved} :
4 - $\sqrt{5}$

So, our final solutions for the equation $x^{2}$ - 8x + 16 = 5 are...

x = 4 + $\sqrt{5}$

and 

x = 4 - $\sqrt{5}$

Hope this helps!

- Lindsey Frazier ♥

5 0

4 years ago

Hurry help help help help help

11Alexandr11 [23.1K]

Answer:

7 < x < 17

Step-by-step explanation:

Solving the first equation:

x + 5 > 12

x > 7 (subtract 5 from both sides)

Solving the second equation:

x - 5 < 12

x < 17 (add 5 to both sides)

Now, combine the two equations:

x > 7 and x < 17 become

7 < x < 17

6 0

3 years ago