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Reil [10]
3 years ago
7

Calculate (7y + 120) + (5y +168) = 180

Mathematics
1 answer:
saul85 [17]3 years ago
3 0

Answer:

y = -9

Step-by-step explanation:

Isolate the variable by dividing each side by factors that don't contain the variable.

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The keyboard of a piano has 88 keys. Generate the equivalent prime factorization of 88.
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Answer:

11 x 2^3 =11 x 2 x 2 x 2 = 88

Step-by-step explanation:

88

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2 years ago
What is the answer to -6n^2 - 5n - 7 = -8
soldi70 [24.7K]

Answer:

n = \frac{1}{3} , n = \frac{1}{2}

Step-by-step explanation:

6n² - 5n - 7 = - 8 ( add 8 to both sides )

6n² - 5n + 1 = 0 ← in standard form

Consider the product of the factors of the coefficient of the n² term and the constant term which sum to give the coefficient of the n- term

product = 6 × 1 = 6 and sum = - 5

The factors are - 3 and - 2

Use these factors to split the n- term

6n² - 3n - 2n + 1 = 0 ( factor the first/second and third/fourth terms )

3n(2n - 1) - 1(2n - 1) = 0 ← factor out (2n - 1) from each term

(2n - 1)(3n - 1) = 0 ← in factored form

Equate each factor to zero and solve for n

3n - 1 = 0 ⇒ 3n = 1 ⇒ n = \frac{1}{3}

2n - 1 = 0 ⇒ 2n = 1 ⇒ n = \frac{1}{2}

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3 years ago
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