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3 years ago

Six times the sum of a number and seven is 30. Find the number.

Mathematics

2 answers:

Sedaia [141]3 years ago

3 0

Answer:

x = -2

Step-by-step explanation:

6(x+7)=30

6x+42=30

6x=-12

x=-2

MAVERICK [17]3 years ago

3 0

Step-by-step explanation:

Hey there!!

According to the question,

One number is 7.

Let another no. be x.

So, the condition is 6(x+7)= 30

Now,

6(x+7) = 30

6x +42 = 30

6x = 30-42

$x = \frac{ - 12}{6}$

Therefore the no. is -2.

Check,

6(-2+7)= -12 + 42 = 30 { they gets subtracted but sign remains (+) only }.

Hope it helps....

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Answer:

See Explanation.

General Formulas and Concepts:

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Step-by-step explanation:

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Step 2: Differentiate

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Differentiate [Ln/Chain Rule/Basic Power Rule]: $\frac{dt}{dx} = \frac{1}{2x-1} \cdot 2 - \frac{1}{x-1} \cdot 1$
Simplify: $\frac{dt}{dx} = \frac{2}{2x-1} - \frac{1}{x-1}$
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Combine: $\frac{dt}{dx} = \frac{-1}{(2x-1)(x-1)}$
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