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Anastasy [175]
2 years ago
10

Solve the equation using mental math.

Mathematics
2 answers:
Umnica [9.8K]2 years ago
4 0

I guess answer should be C

ki77a [65]2 years ago
3 0
Answer is C. 3 start fraction 5 over 7 end fraction.
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Can someone help me i keep getting different answer!!
spayn [35]

Answer:

The second option: 3 (6 - 5n)/20n

Step-by-step explanation:

Make sure all fractions have a common denominator:

Step 1. Find a common multiple between all three denominators

5, 4, and 10 all have a common multiple of 20. Proof: 5 × 4 = 20, 4 × 5 = 20, and 10 × 2 = 20

Step 2. Multiply the denominators to get to 20. Whatever you do to the bottom (denominator) must be done to the top (numerator).

1/5n × 4/4 = 4/20n

3/4 × 5n/5n = 15n/20n

7/10n × 2/2 = 14/20n

Your fractions now all have a common denominator of 20n.

Rewrite the equation using the new fractions:

4/20n - 15n/20n + 14/20n

Only focus on adding/subtracting the numerators; the denominators will stay the same: 20n.

(4 - 15n + 14)/20n

Combine like terms:

(18 - 15n)/20n

Factor out any numbers possible:

3(6 - 5n)/20n

Note* 3 go into both 18 and 15, which allows us to factor 3 out. 18 ÷ 3 = 6 and 15 ÷ 3 = 5, giving us our new numbers inside the parentheses.

6 0
3 years ago
On a coordinate plane, triangle L M N has points (1, negative 1), (3, 2), and (1, 3). An altitude is drawn from point M to point
PIT_PIT [208]
The answer is 4 units.
7 0
3 years ago
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The midpoint of GH is (-2,3), and its endpoints are G (g,4) and H (-2,h). What are the values of g and h?
KonstantinChe [14]

Answer:

g =-2

h = 2

Step-by-step explanation:

left end      middle     right end

G(g,4)          (-2,3)         (-2,h)

7 0
2 years ago
Simplify the expression -4x2(3x − 7).
FromTheMoon [43]

Answer:

-12x^3 + 28x^2

4 0
3 years ago
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20 Points and markwd brainliest
liberstina [14]

Answer:

B

Step-by-step explanation:

4 0
2 years ago
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