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olganol [36]
3 years ago
5

-2(9 + 3n) - 9 (1 - 10n)*

Mathematics
2 answers:
Pachacha [2.7K]3 years ago
5 0

Answer:

-27+84n

Step-by-step explanation:

-2(9 + 3n) - 9 (1 - 10n)

First, Distribute the -2 and -9

18-6n-9+90n

Next, combine like terms (18n and 90n) (-4 and -9)

leaving you with -27 + 84n

GuDViN [60]3 years ago
4 0

Answer:

-27+84n

Step-by-step explanation:

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The answer is: E

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3 years ago
Need help ASAP!!!!!!
trapecia [35]

Answer:

see explanation

Step-by-step explanation:

x² + 3x + 7 = 5 ( subtract 5 from both sides )

x² + 3x + 2 = 0 ← in standard form

(x + 2)(x + 1) = 0 ← in factored form

Equate each factor to zero and solve for x ( zero product rule )

x + 2 = 0 → x = - 2

x + 1 = 0 ⇒ x = - 1

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

x² - 2 = - 2x² + 5x ( subtract - 2x² + 5x from both sides )

3x² - 5x - 2 = 0 ← in standard form

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

Equate each factor to zero and solve for x

3x + 1 = 0 ⇒ 3x = - 1 ⇒ x = - \frac{1}{3}

x - 2 = 0 ⇒ x = 2

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

(x + 3)² + 4x = 0 ← expand left side using FOIL and simplify

x² + 6x + 9 + 4x = 0

x² + 10x + 9 = 0 ← in standard form

(x + 9)(x + 1) = 0 ← in factored form

Equate each factor to zero and solve for x

x + 9 = 0 ⇒ x = - 9

x + 1 = 0 ⇒ x = - 1

4 0
3 years ago
Convert 7 months into days.
IgorC [24]

Answer:

212 days are in 7 months

7 0
2 years ago
Read 2 more answers
On the first math test, Keiko answered 19 out of 25 questions correctly. On the second test she got 17 out of 20 correct. On whi
jenyasd209 [6]

Answer:

shegot a better score on the second test

50 is double of 25

75is 3 times 25

100 is 4 times 25

Step-by-step explanation:

19 times 4= 76

17 times 5= 85

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3 years ago
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