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grandymaker [24]
2 years ago
10

Solve 15=3n+6p, for n

Mathematics
2 answers:
Studentka2010 [4]2 years ago
8 0
This is how I solved it

Fynjy0 [20]2 years ago
7 0

Answer:

n=5-2p

Step-by-step explanation:

STEP 1: <em>Rewrite the equation as  3 n + 6 p = 15 .</em>

3n+6p=15

STEP 2: <em>Subtract  6 p  from both sides of the equation.</em>

3n=15-6p

STEP 3: <em>Divide each term by  3  and simplify.</em>

n=5-2p

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If a &lt; 0 and c &gt; b, circle the expression that is greater:
matrenka [14]

Answer:

The expression that is greater is a (b - c)

Step-by-step explanation:

  • a < 0 and c > b, this means <u>(by the addition property)</u> that c - c > b - c⇒0 > b - c

so for the product <u>a(b - c) </u>we would have a multiplication of a negative number <em>a</em> and another negative number <em>(b - c)</em>. We know that the result of the <u>multiplication of two negative numbers  is a positive number.</u>

Therefore, a (b - c) > 0

  • a < 0 and c > b, this means <u>by the addition property</u> that c - b > b - b⇒ c - b > 0

so for <u>a(c - b)</u>, we have the negative number <em>a</em> multiplied by the positive number <em>(c - b). </em>We know that the result of the <u>multiplication of a negative number by a positive number is negative. </u>

<u>Therefore  a (c - b) < 0</u>

Thus, the expression that is greater is the positive one which is a (b - c)

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Please help me answer questions 48 and 48 with the working out please. This is very urgent and i’m giving out 8 points not 5!!!
mariarad [96]

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<u>Step-by-step explanation:</u>

E=w(t_f-t_o)\\\\E: 10\ cubic\ feet\times \dfrac{1000\ BTU}{1\ cubic\ foot}\times \ 60\%\quad \rightarrow \quad E=6000\ BTU\\\\\\w:50\ gallons\times \dfrac{8\ pounds}{1\ gallon}\quad \rightarrow \quad w=400\ pounds\\\\\\\\E=w(t_f-t_o)\\\\6000=400(t_f-50)\\\\\dfrac{6000}{400}=\dfrac{400(t_f-50)}{400}\\\\.\quad 15=t_f-50\\\\\\.\quad 15=t_f-50\\.\ \underline{+50}\quad \underline{\quad \ +50}\\.\quad 65=t_f

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givi [52]

Answer:

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Step-by-step explanation:

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