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DochEvi [55]
3 years ago
7

Use a periodic table to find symbol,atomic mass number for each of the following elements need help thank you

Mathematics
2 answers:
k0ka [10]3 years ago
7 0
(*KEY*
Element = Symbol, atomic mass #)

Calcium = Ca, 20
Sodium = Na, 11
Carbon = C, 6
Hydrogen = H, 1
Oxygen = O, 8
muminat3 years ago
6 0
Element | Symbol  |  Atomic Number  |  Atomic Mass
Calcium -    Ca                  20                     40.078
Sodium -     Na                  11                     22.990
Carbon -      C                     6                     12.011
Hydrogen -   H                    1                      1.008
Oxygen -      O                    8                      15.999
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At first it decreased by 60 percent and it increased by 80 percent
storchak [24]

The quantity reported an <em>equivalent net</em> percentage change of 28 percent.

<h3>How to calculate the net change of a quantity in percentages</h3>

In this problem we must determine the <em>simple</em> percentage change equivalent to two <em>consecutive</em> percentual changes. The formula that describes the situation is:

1 + r/100 = (1 - 60/100) · (1 + 80/100)

1 + r/100 = 72/100

r/100 = - 28/100

r = - 28

The quantity reported an <em>equivalent net</em> percentage change of 28 percent.

<h3>Remark</h3>

The statement is incomplete. Complete form is presented below:

A quantity is changing. At first it descreased by 60 percent and it increased by 80 percent. What is net change of the quantity in percentage?

To learn more on percentages: brainly.com/question/13450942

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1 year ago
0.580 repeating as a fraction
ElenaW [278]

Answer:

Write out your decimal as the numerator of a fraction:

0.50 /1

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Find the Greatest Common Factor of 50 and 100:

GCF is 50

Divide both numerator and denominator by 50:

50 ÷ 50

100 ÷ 50 =  1 /2

therefore your answer is 1/2

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3 years ago
Samuel took out a personal loan of $13,000 at 7% simple interest. a. How much interest will he pay after 4 years? Show your work
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3 years ago
Ron estimates that each crate of apples he buys from his supplier has 120 apples. The actual number is 105 apples. Which value i
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Answer:

14%

Step-by-step explanation:

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8 0
3 years ago
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Log(x+6)-log(x-3)=1<br><br> I need to show work, please show me how
Illusion [34]

Answer:

x = 4.

Step-by-step explanation:

log(x + 6)- log(x - 3) = 1

Using the law log a - log b = log a/b:

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Removing logs:

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9x = 36

x = 4 (answer).

8 0
3 years ago
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