2 years ago

Which expression is equivalent to 2^4 ⋅ 2^−7?

2 answers:

8 0

Remember
$(x^m)(x^n)=x^{m+n}$
and
$x^{-m}=\frac{1}{x^m}$

so
$(2^4)(2^{-7})=$
$2^{4-7}=$
$2^{-3}=$
$\frac{1}{2^3}=$
$\frac{1}{8}$

ivanzaharov [21]2 years ago

5 0

Answer:

The answer is 1 over 2^3

Step-by-step explanation:

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A radioactive substance decays at a rate of 25% every 10 years. Which equation represents the amount of the substance (S) remain

Lelechka [254]

Answer:

$y = 100 * (0.75)^{30$

Step-by-step explanation:

Given

$a =100$ --- Initial Amount

$r= 25\%$ every 10 years

Required

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To do this, we make use of:

$y = a(1 - r)^T$

Where

r = decay rate

T = the period of decay

In 300 years, there are 30 periods of 10 years.

i.e.

$T = \frac{300}{10}$

$T = 30$

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$y = 100 * (1 - 25\%)^{30$

$y = 100 * (1 - 0.25)^{30$

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3 years ago

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Answer:

Step-by-step explanation:

first find the perimeter of both triangles

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scaled perimeter: 24 in

A is wrong since the scaled perimeter is actually smaller.

B is wrong because its not 6 times smaller

C is wrong since it's not 1/9 of the original

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6 0

2 years ago

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Answer:

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Step-by-step explanation:

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What is the simplified expression

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Answer:

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3 years ago

the length of a rectangle is 5 ft more than the width. The. Is 22 ft. Find the width of a rectangle.

musickatia [10]

Answer:

To the tenth = 2.8

Step-by-step explanation:

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