3 years ago

True or false. -5+ ( -3 +( -8) = -5 + ( - 3 + 8 )

Mathematics

1 answer:

TiliK225 [7]3 years ago

4 0

The answer is true .

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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

grandymaker [24]

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%

4 0

3 years ago

I have no idea how to do these.

Alex

Answer:

1. {-1 , 0, 1 }

Step-by-step explanation:

The range is the set of the second values in the ordered pairs.

8 0

2 years ago

Read 2 more answers

The sum of 2 of the exterior angles of a triangle is 222 degrees. What is the measure of the third exterior angle?