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natita [175]
3 years ago
7

Use substitution to solve each system of equations. 4x – 5y = –7 y = 5x

Mathematics
2 answers:
Komok [63]3 years ago
8 0
Refer to answers in the picture.

sweet [91]3 years ago
3 0
4x - 5(5x)= -7
4x - 25x = -7
-21x = -7
x = 1/3

y = 5(1/3)
y = 5/3
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What percent of a present amount of radioactive radium (226Ra) will remain after 1200 years? The half life of 226Ra is 1599 year
sp2606 [1]

Answer:

59.44%

Step-by-step explanation:

<em>M_{R} = \frac{M_{O} }{2^{n} }</em>

<em>n=\frac{t}{t\frac{1}{2} }</em>

<em>Where M_{R} = mass remaining</em>

<em>M_{O} =original mass.</em>

<em>t= time </em>

<em>t\frac{1}{2} =half life</em>

t\frac{1}{2} =1599,  t= 1200, M_{O} =226,  M_{R} =?

n=\frac{1200}{1599}

n= 0.750469

M_{R} = \frac{226}{2^{ 0.750469} }

M_{R} =134.3367amu

percentage of mass remaining = \frac{134.3367amu}{226amu} *100%

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8 0
3 years ago
Find sin–10.9563 to the nearest degree
rosijanka [135]

Answer:

The sine function can only have values from -1 to +1

Step-by-step explanation:

8 0
4 years ago
Read 2 more answers
Find the value of the following expression: (2^8 • 5^-5 • 19^0)^-2 • (5^-2 over 2^3)^4 • 2^28. Write your answer in simplified f
DaniilM [7]
Recognize that "( ) over 2^3" means ( ) • 2^-3. Use the rule of exponents
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= 2^-16•5^10•19^-2 • 5^-8*2^-12 • 2^28

Now, you can use the rule of exponents
.. (a^b)*(a^c) = a^(b+c)

= 2^(-16 -12 +28) • 5^(10 -8) • 19^-2
= 5^2 • 19^-2
= 5^2 / 19^2
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4 years ago
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soldier1979 [14.2K]
The answer to your question would most likely be iced tea.
4 0
3 years ago
Someone help with this please
Rzqust [24]
Hey there,

Your correct answer would be "It is a vertex at it origin"

Hope this helps.

~Jurgen
7 0
4 years ago
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