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3 years ago

- - Use the Quadratic Formula to solve the equation x2 – 2x = -9.

Mathematics

1 answer:

mina [271]3 years ago

4 0

No solution

Hope that helps

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4 years ago

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First Answer Is 15
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3 years ago

The half-life of cesium-137 is 30 years. Suppose we have a

VMariaS [17]

(a) If $y(t)$ is the mass (in mg) remaining after $t$ years, then $y(t) = y(0) e^{kt}=100e^{kt}.$

$y(30) = 100 e^{30k} = \frac{1}{2}(100) \implies e^{30k} = \frac{1}{2} \implies k = -(\ln 2) /30 \implies \\ \\
y(t) = 100e^{-(\ln 2)t/30} = 100 \cdot 2^{-t/30}$

(b) $y(100) = 100 \cdot 2^{-100/30} \approx \text{9.92 mg}$

(c)
$100 e^{- (\ln 2)t/30} = 1\ \implies\ -(\ln 2) t / 30 = \ln \frac{1}{100}\ \implies\ \\ \\
t = -30 \frac{\ln 0.01}{\ln 2} \approx \text{199.3 years}$

3 0

3 years ago

Please help! Thank you! Also, please explain thank you!

viva [34]

Answer:

2x=10*11

2x=110

x=55

5 0

4 years ago

Please I really need help with this question!!!!!

Nina [5.8K]

To solve this problem, we must consider all the trigonometric equations:

⇒ (see image below)

Let's examine the diagram:

the side adjacent to ∠A ⇒ AC ⇒ 35 meters
hypotenuse ⇒ 53 meters

Thus we can use:

$cos(A)=\frac{35}{53} \\A= cos^{-1}(\frac{35}{53})\\ A = 48.67$

Answer: 49 degrees (as rounded)

Hope that helps!

3 0

3 years ago

- - Use the Quadratic Formula to solve the equation x2 – 2x = -9.​

- - Use the Quadratic Formula to solve the equation x2 – 2x = -9.