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son4ous [18]
3 years ago
5

What's the answer for this equation 1/3(y+7)=3(y−1)

Mathematics
1 answer:
Dominik [7]3 years ago
6 0
Answer: -(3y*3(y+7)+1=0
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The surface area of a given cone is 1,885.7143 square inches. What is the slang height?
kap26 [50]

Answer:

If r >> h, the slang height of the cone is approximately 23.521 inches.

Step-by-step explanation:

The surface area of a cone (A) is given by this formula:

A = \pi \cdot r^{2} + 2\pi\cdot s

Where:

r - Base radius of the cone, measured in inches.

s - Slant height, measured in inches.

In addition, the slant height is calculated by means of the Pythagorean Theorem:

s = \sqrt{r^{2}+h^{2}}

Where h is the altitude of the cone, measured in inches. If r >> h, then:

s \approx r

And:

A = \pi\cdot r^{2} +2\pi\cdot r

Given that A = 1885.7143\,in^{2}, the following second-order polynomial is obtained:

\pi \cdot r^{2} + 2\pi \cdot r -1885.7143\,in^{2}  = 0

Roots can be found by the Quadratic Formula:

r_{1,2} = \frac{-2\pi \pm \sqrt{4\pi^{2}-4\pi\cdot (-1885.7143)}}{2\pi}

r_{1,2} \approx -1\,in \pm 24.521\,in

r_{1} \approx 23.521\,in \,\wedge\,r_{2}\approx -25.521\,in

As radius is a positive unit, the first root is the only solution that is physically reasonable. Hence, the slang height of the cone is approximately 23.521 inches.

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3 years ago
PLS HELP PLS PLS!!!!!!
jenyasd209 [6]

Answer:

m > 1

Step-by-step explanation:

Minus 6 from both side

m = 1

4 0
3 years ago
Good stuff is giving away free pens to each of the first 200 people who came in the store today. In the first hour, they gave aw
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Answer:

150 pens

Step-by-step explanation:

1. 75% = 0.75

2. 200 * 0.75 = 150 pens

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3 years ago
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Why is 3/12 a rational number
iVinArrow [24]
3/12 is a rational number because rational numbers can be written in the form of a/b

When you simplify 3/12, you get 1/4, which is a fraction
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3 years ago
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Solve the system of equations
miv72 [106K]

Answer:

y = -3 when x = 4

Step-by-step explanation:

2x-4y = 20

x = 4

2(4) - 4y = 20

8 - 4y = 20

-4y = 12

y = -3

5 0
3 years ago
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