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Valentin [98]
2 years ago
12

Does anybody know this

Mathematics
1 answer:
Dmitrij [34]2 years ago
6 0

Step-by-step explanation:

The equation used to determine the amount of radioactive material left is

A = A_0(2)^{-t/HL}

We are have the following given quantities:

t = 30 seconds

A_0 = 50 grams

HL = 6 seconds

Plugging these into our equation we get

A = (50\:\text{grams})(2)^{-(30s/6s)}

\:\:\:\:= (50\:\text{grams})(0.03125)

\:\:\:\:= 1.56\:\text{grams}

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I need the answers if you know them you’ll get 80 points
katrin2010 [14]
For number 1, it says based on the first two clues, so you would still include the even numbers ranging from 70-81. Then for number 2 we would use clue C because it gives us the most information about our number.
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3 years ago
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An airplane climbs 100 feet during the first second after takeoff. In each succeeding second it climbs 100 feet more than it cli
tigry1 [53]

Answer:

15 seconds.

Step-by-step explanation:

∵ The distance covered by plane in first second = 100 ft,

Also, in each succeeding second it climbs 100 feet more than it climbed during the previous second,

So, distance covered in second second = 200,

In third second = 300,

In fourth second = 400,

............, so on....

Thus, the total distance covered by plane in n seconds = 100 + 200 + 300 +400......... upto n seconds

=\frac{n}{2}(2\times 100 + (n-1)100)  ( Sum of AP )

=\frac{n}{2}(200+100n-100)

=\frac{n}{2}(100+100n)

=50n+50n^2

Suppose the distance covered in n seconds is 12,000 feet,

\implies 50n+50n^2=12000

n+n^2=240

n^2+n-240=0

n^2+16n-15n-240=0

n(n+16)-15(n+16)=0

(n-15)(n+16)=0

\implies n=15\text{ or }n=-16

∵ n can not be negative,

Hence, after 15 seconds the plane will reach an altitude of 12,000 feet above its takeoff height.

6 0
3 years ago
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HELPPPPPPPP!!!!!!!!!!!!
trapecia [35]

Answer:

able to be believed; convincing. hope this helped

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What two dimensional cross-sections could be created by slicing a sphere
Nuetrik [128]
An intersection through the sphere
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The measures of two angles are given along with the measure of the side 4 points
FrozenT [24]

Answer:

C

Step-by-step explanation:

Let say for example, the triangle is named ∆ABC, and the two angles given are <A and <B with a given side, c, opposite to the third angle (<C).

Since sum of triangle = 180°, we can find the third angle by saying:

m<C = 180 - (m<A + m<B).

Having found the third angle measure, <C, we can mow apply the Law of Sines to find the length of the other two sides (a and b) that are opposite to <A and <B respectively.

4 0
3 years ago
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