3 years ago

Which expression is equal to (7 × 2) × 2?

Mathematics

2 answers:

Debora [2.8K]3 years ago

5 0

The answer is C. 7 x ( 2 x 2 )

Sever21 [200]3 years ago

4 0

Answer:

Step-by-step explanation:

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A scientist has 100 milligrams of a radioactive element. The amount of radioactive element remaining after t days can be determi

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The mass of the first shipment at time t is
$m_{1}=100( \frac{1}{2} )^{ \frac{t}{10}}$

The mass of the second shipment at time t is
$m_{2}=100( \frac{1}{2} )^{ \frac{t-3}{10} }$

At time t, the ratio of m₁ to m₂ is
$\frac{m_{1}}{m_{2}} = \frac{100}{100}. \frac{(1/2)^{t/10}}{(1/2)^{(t-3)/10}} \\ = \frac{(1/2)^{t/10}}{(1/2)^{t/10}}. \frac{1}{(1/2)^{-3/10}} \\ = (1/2)^{3/10} \\ = 0.8123$

Therefore as a percentage,
$\frac{m_{1}}{m_{2}} =100*0.8123 = 81.23 \%$

Answer: B. 81.2%

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4 years ago

Please help and also include an explanation so I know how you got the answer.

Nastasia [14]

Answer:

x = 15

Step-by-step explanation:

We know that 4x° + 8x° make a straight angle of 180°.

4x° + 8x° = 180°

12x° = 180°

12x = 180

x = 180/12 = 15

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3 years ago

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I don't really get it

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I can't see the whole pic...

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3 years ago

Could someone give me some advice?

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Don’t stress. try taking a nap. or watching a movie. Or listen to calming music.

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3 years ago

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