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3 years ago

Which gives the prices in order, from least to greatest

Mathematics

1 answer:

k0ka [10]3 years ago

3 0

Answer:

is there a picture to go with the problem?

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Tyra’s father is two years more than three times as old as she is. If Tyra is nine years old, how old is her father?

Marianna [84]

Answer:

A - 29

Step-by-step explanation:

she is Nine so

her dad will be

2+9×3

2+27

5 0

3 years ago

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Chealsea wants to rearrange her room

Llana [10]

Answer:

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3 years ago

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Element X decays radioactively with a half life of 12 minutes. If there are 200 grams of Element X, how long, to the nearest ten

Semenov [28]

Answer:

It would take 24 minutes for the element to decay to 50 grams

Step-by-step explanation:

The equation for the amount of the element present, after t minutes, is:

$Q(t) = Q(0)e^{-rt}$

In which Q(X) decays radioactively with a half life of 12 minutes.(0) is the initial amount and r is the rate it decreases.

Half life of 12 minutes

This means that $Q(12) = 0.5Q(0)$

$Q(t) = Q(0)e^{-rt}$

$0.5Q(0) = Q(0)e^{-12r}$

$e^{-12r} = 0.5$

$\ln{e^{-12r}} = \ln{0.5}$

$-12r = \ln{0.5}$

$12r = -\ln{0.5}$

$r = -\frac{\ln{0.5}}{12}$

$r = 0.05776$

If there are 200 grams of Element X, how long, to the nearest tenth of a minute, would it take the element to decay to 50 grams?

This is t when Q(t) = 50. Q(0) = 200.

$Q(t) = Q(0)e^{-rt}$

$50 = 200e^{-0.05776t}$

$e^{-0.05776t} = 0.25$

$\ln{e^{-0.05776t}} = \ln{0.25}$

$-0.05776t = \ln{0.25}$

$0.05776t = -\ln{0.25}$

$t = -\frac{\ln{0.25}}{0.05776}$

$t = 24$

It would take 24 minutes for the element to decay to 50 grams

6 0

4 years ago

What is the inverse of h?

Paha777 [63]

H(x) = 6x + 1

turn h(x) into y

y = 6x + 1

switch the x and the y

x = 6y + 1

solve for y

6y = x - 1
y = 1/6x - 1/6
y = 1/6(x - 1)

now stick the inverse notation in for y....h -1(x)

h-1(x) = 1/6(x - 1).....I think I did that right

4 0

3 years ago

Find the length of the third angle of a triangle given that the first two angles are 35 and 70.

ss7ja [257]

Hi,

the interior angles of a triangle always add up to 180 degrees. Therefore 35 + 70 + ? = 180.
so, 35+70 = 105. 180-105= 75 degrees.

7 0

3 years ago