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3 years ago

81+7x=81 what does x equal?

2 answers:

5 0

So to start off here is the question being asked:
81+7x=81
The first thing we are going to do is simplify both sides of the equation:
7x+81=81
Second thing to do is subtract 81 from both sides so:
7x+81−81=81−81
The final thing to do is divide both sides by 7:
7x/7=0/7
The final answer is:
x=0

I hope this helps! :)

Brrunno [24]3 years ago

4 0

The answer is x=7 because wen you subtract 81 from 81 it equals zero leving 7x or x=7

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What are the factors of the following quadratic equation 12=x^2-x

Valentin [98]

12 = x² - x
12 - 12 = x² - x - 12
0 = x² - x - 12
x² - x - 12 = 0
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x = 1 +/- √(1 + 48)
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x = 1 +/- √(49)
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3 years ago

During a manufacturing process, a metal part in a machine is exposed to varying temperature conditions. The manufacturer of the

mars1129 [50]

Answer:

Yes, it will reach or exceed 141 degree F

Step-by-step explanation:

Given equation that shows the temperature T in degrees Fahrenheit x minutes after the machine is put into operation is,

$T = 0.005x^2 + 0.45x + 125$

Suppose T = 141°F,

$\implies 141 = 0.005x^2 + 0.45x + 125$

$\implies 0.005x^2 + 0.45x + 125 - 141 =0$

$\implies 0.005x^2 + 0.45x - 16=0$

Since, a quadratic equation $ax^2 + bx + c =0$ has,

Real roots,

If Discriminant, $D = b^2 - 4ac \geq 0$

Imaginary roots,

If D < 0,

Since, $0.45^2 - 4\times 0.005\times -16 = 0.2025 + 32 > 0$

Thus, roots of -0.005x² + 0.45x + 125 are real.

Hence, the temperature can reach or exceed 141 degree F.

6 0

3 years ago

The volume of a sphere is 2,098 pi m^3 what is the surface area of the sphere to the nearest tenth?

Karo-lina-s [1.5K]

Answer:

3139.5 m²

Step-by-step explanation:

the formula for the volume of a sphere of radius r is V = (4/3)πr³. In this particular case, V = 2098π m³ = (4/3)πr³, and from this we can calculate the radius, r:

2098π m³

r³ = ----------------- = (3/4)(2098 = 1483/5

(4/3)π

Thus r = ∛1573.5 m³ = 11.64 m

Then the surface area is A = 4πr², which in this case is

A = 4(3.14159)(11.64 m)^2 = 1702.6 m² (which is to the nearest tenth).

8 0

3 years ago

8 is to 64 as 2 is to x

alina1380 [7]

X is 4 because 64 is 8 squared, so 4 would be 2 squared

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Answer:

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2 years ago

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