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3 years ago

Solve for x. 3(x−4)/2=9 Enter your answer in the box. x =

Mathematics

2 answers:

Dmitriy789 [7]3 years ago

8 0

Answer:

x=5

Step-by-step explanation:

3(x-4)/2=9

Distribute 3

3x-12/2=9

3x-6=9

add 6 to both sides

3x=15

divide both sides by 3

x=5

snow_lady [41]3 years ago

6 0

Answer:

x = 10

Explanation:

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Rudik [331]

Answer:

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Step-by-step explanation:

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Step2247 [10]

Answer:

$A = 297\pi$

Step-by-step explanation:

To solve this problem we need to be familiar with the formula for the surface area of a cone:

$A = \pi r(r + \sqrt{h^2+r^2})$

We are given the length of a side and the diameter, to calculate the radius divide the diameter in half:

$r = \frac{d}{2}\\r = \frac{18}{2}\\r = 9 cm$

To calculate the height of the cone, we must use the Pythagorean Theorem:

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We can treat the side length as the hypotenuse $C$ , the radius as the base $A$ , and solve for height $B$ . Set the expression up like this:

$C^2 = A^2 + B^2\\24^2 = 9^2 + B^2\\B^2 = 24^2 - 9^2\\B = \sqrt{24^2 - 9^2}\\B = \sqrt{576 - 81}\\B = \sqrt{495}\\B \approx 22.25$

Now we can plug into our original formula:

$A = \pi r(r + \sqrt{h^2+r^2})\\A = \pi 9(9+\sqrt{\sqrt{495}^2+9^2}\\A = \pi 9(9+\sqrt{495 + 81}\\A = \pi 9(9+\sqrt{576})\\A = \pi 9(9 + 24)\\A = \pi 9(33)\\A = 297\pi$

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