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Licemer1 [7]
3 years ago
5

PLEASE PLEASE PlEASE I NEED HELP!!!

Mathematics
1 answer:
Eva8 [605]3 years ago
6 0

Answer:

As the property of angle on circle:

Arc DF = 2 x angle DEF = 2 x 72 = 144 deg

=> Option B is correct

Hope this helps!

:)

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HELP!!!
scoundrel [369]

Answer:

<em>The metalworker should use 60 kg of metal alloy that is 70% copper and 40 kg of metal alloy that is 20% copper.</em>

Step-by-step explanation:

<u>System of Equations </u>

Let's call  

x=amount of metal alloy that is 20% copper

y=amount of metal alloy that is 70% copper

The metalworker wants to create 100 Kg of 50% copper alloy. This gives us the first relation

x+y=100

The combination of 20% of x and 70% of y will produce 50% of the sum of both, thus

20x+70y=50(x+y)

Operating

20x+70y=50x+50y

Reducing and dividing by 10

2y=3x

The system of equations is easily solved by isolating x in the first equation

x=100-y

And replacing into the last equation

2y=3(100-y)

Operating

2y=300-3y

5y=300

y=60

Thus

x=100-60=40

The metalworker should use 60 kg of metal alloy that is 70% copper and 40 kg of metal alloy that is 20% copper.

3 0
3 years ago
Write a sentence that describes the relationship between the dependent variable and the independent variable. (Hint: Ratio langu
BartSMP [9]
An Independent variable can change the dependent variable because the independent variable can be changed alone while a dependent variable can also be changed by another variable.

correct me if I am wrong.
5 0
3 years ago
Can someone help please help sorry I know it’s easy but ......
NARA [144]

Answer:

standard

Step-by-step explanation:

4 0
2 years ago
Solve -7x = -56<br> Help me
OleMash [197]
Easily done! Just do -56 divided by -7 but just remember two negatives equal a positive. So your answer would be 8!
8 0
3 years ago
Read 2 more answers
Solve for x: - 2x – 4 &lt; 10
Charra [1.4K]

Answer:

The correct answer would be the second one: x > - 7

Step-by-step explanation:

Hope this helps!

8 0
3 years ago
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