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3 years ago

Hey can anybody give me a teachers answer key on dis lessons

Mathematics

1 answer:

KATRIN_1 [288]3 years ago

3 0

Hm maybe look up the name of the document and put pdf answers

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una alberca tiene forma de prisma rectangular sus dimensiones son 12 metros de largo 6 metros de ancho y 3 metros de profundidad

kap26 [50]

Answer:

216 metros

Step-by-step explanation:

solo tienes que multiplicar todo

12x6x3 = 216 metros

8 0

3 years ago

Rewrite the quadratic y=3(x-2)^2-7 in standard form

DochEvi [55]

Answer:

The answer is

y=3/(x-2)^5

8 0

3 years ago

he radioactive element carbon-14 has a half-life of 5750 years. A scientist determined that the bones from a mastodon had lost

elena-s [515]

Answer:

The bones were 12,485 years old at the time they were discovered.

Step-by-step explanation:

Amount of the element:

The amount of the element after t years is given by the following equation, considering the decay rate proportional to the amount present:

$A(t) = A(0)e^{-kt}$

In which A(0) is the initial amount and k is the decay rate, as a decimal.

The radioactive element carbon-14 has a half-life of 5750 years.

This means that $A(5750) = 0.5A(0)$ , and we use this to find k. So

$A(t) = A(0)e^{-kt}$

$0.5A(0) = A(0)e^{-5750k}$

$e^{-5750k} = 0.5$

$\ln{e^{-5750k}} = \ln{0.5}$

$-5750k = \ln{0.5}$

$k = -\frac{\ln{0.5}}{5750}$

$k = 0.00012054733$

$A(t) = A(0)e^{-0.00012054733t}$

A scientist determined that the bones from a mastodon had lost 77.8 % of their carbon-14. How old were the bones at the time they were discovered?

Had 100 - 77.8 = 22.2% remaining, so this is t for which:

$A(t) = 0.222A(0)$

Then

$0.222A(0) = A(0)e^{-0.00012054733t}$

$e^{-0.00012054733t} = 0.222$

$\ln{e^{-0.00012054733t}} = \ln{0.222}$

$-0.00012054733t = \ln{0.222}$

$t = -\frac{\ln{0.222}}{0.00012054733}$

$t = 12485$

The bones were 12,485 years old at the time they were discovered.

8 0

3 years ago

When I double my number, add four, and then subtract my number and subtract three, I get my number plus one. What is my number?

Helen [10]

The number is 2 because 4_

3=1 and 1+1=2

8 0

3 years ago

The health department estimates that eight vials of malaria Serum will treat 100 people. at this rate, how many vials are requir

lara [203]

Using butterfly method, it is 14 vials

5 0

3 years ago