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3 years ago

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Which equations are true for x = –2 and x = 2? Select two options x2 – 4 = 0 x2 = –4 3x2 + 12 = 0 4x2 = 16 2(x – 2)2 = 0

1 answer:

Serhud [2]3 years ago

6 0

It is x2-4=0 and 4x 2 = 16

Hope this helps you!!!

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2) If Michael invests $2000 in the bank at a rate of 5.5% for 6 years how much

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Answer:

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Step-by-step explanation:

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2 years ago

What is the factor each expression of x2 - 2x

horrorfan [7]

Answer:

x(x - 2)

Step-by-step explanation:

x² - 2x ← factor out x from each term

= x(x - 2)

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2 years ago

What is the area of the shape below?

mixas84 [53]

76 cm,

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3 years ago

Find the capacity of the tanks with the following internal dimensions. Express the capacity in cubic meters and liters for each

Vladimir [108]

Step-by-step explanation:

i) Capacity(Volume) = length x breadth x depth

= 3.2 x 2.9 x 1.5

= 13.92 m³

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= 36.792 m³

In litres, 36.792 x 1000 = 36,792 litres

3 0

3 years ago

A sample of Iron-59 contains 50 mg. One hundred days later, the sample contains 10.75 mg. What is the half-life of iron-59, in d

exis [7]

Answer:

$t_{1/2}=45.09 d$

Step-by-step explanation:

We can use the decay equation:

$M=M_{0}e^{-\lambda t}$

M(0) is the initial mass
M is the mass after t (1000 days) time
λ is the decay constant

But:

$\lambda = ln(2)/t_{1/2}$

t(1/2) is the half-life.

So, we can rewrite the initial equation:

$M=M_{0}e^{-\frac{ln(2)}{t_{1/2}}t}$

Now, we just need to solve it for t(1/2):

$ln(\frac{M}{M_{0}})=-\frac{ln(2)}{t_{1/2}}t$

$t_{1/2}=-\frac{ln(2)}{ln(\frac{M}{M_{0}})}t$

$t_{1/2}=-\frac{ln(2)}{ln(\frac{10.75}{50})}100$

$t_{1/2}=45.09 d$

I hope it helps you!

5 0

3 years ago