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tester [92]
2 years ago
8

PLEASE HELP DUE TODAY!!

Mathematics
1 answer:
telo118 [61]2 years ago
7 0

9514 1404 393

Answer:

  2.8¢, true

Step-by-step explanation:

The value of copper in a penny is reportedly about ...

  (0.95 × 3.11 g)×(1 oz)/(28.35 g)×($0.27/oz) ≈ $0.028

Today, the value of the copper in a pre-1982 penny is about 2.8¢, more than double the value of the penny as legal tender.

The claim is true.

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at a sale search were sold for $15 each. This price was 80% of the original price. What was the original price?
emmasim [6.3K]
Let's say the original price was "x", thus "x" is the 100%, and we know that 15 is 80% of that, thus

\bf \begin{array}{ccll}
amount&\%\\
\text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\
x&100\\
15&80
\end{array}\cfrac{x}{15}=\cfrac{100}{80}\implies x=\cfrac{1500}{80}
5 0
3 years ago
Read 2 more answers
Solve using elimination.<br><br> –9x + 9y = 18<br> –6x + 9y = –12
Arada [10]
You can multiply either the top or bottom equation by -1 so lets say you apply it to the bottom equation it’ll look like this:

-9x + 9y = 18
6x - 9y = 12

then the +9y and -9y will cancel out

-9x = 18
6x =12

then you add the two equations together

-3x = 30

divide both sides by -3

x = -10
8 0
3 years ago
Read 2 more answers
If answer is correct I will mark as brainliest.
Ilia_Sergeevich [38]

Answer:

No positive real solutions.So the answer is zero.

Step-by-step explanation:

8 0
2 years ago
(Translate each sentence into a formula)
Brilliant_brown [7]

Answer:

A=πr2

THIS IS THE ANSWER

PLEASE MARK BRAINLIEST!!!!!

4 0
3 years ago
19. 140% of 60<br> find the percent of the number. Explain your method
KonstantinChe [14]

Answer:

84

Step-by-step explanation:

is                    x           140

----   SO ...    -------  =  --------

of                  60         100

(hit like pls)

60*140=100x

8400=100x

/100     /100

-------------------

   84 = x

8 0
2 years ago
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