Calculus Examples

$a b = \frac{4}{5}$ , $b c = \frac{14}{10}$ , $c d = \frac{7}{10}$

Step 1

Solve the equation for $c$ .

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Step 1.1

Simplify both sides.

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Step 1.1.1

Combine $\frac{4}{5 a}$ and $c$ .

$\frac{4 c}{5 a} = \frac{14}{10}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.1.2

Cancel the common factor of $14$ and $10$ .

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Step 1.1.2.1

Factor $2$ out of $14$ .

$\frac{4 c}{5 a} = \frac{2 (7)}{10}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.1.2.2

Cancel the common factors.

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Step 1.1.2.2.1

Factor $2$ out of $10$ .

$\frac{4 c}{5 a} = \frac{2 \cdot 7}{2 \cdot 5}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.1.2.2.2

Cancel the common factor.

$\frac{4 c}{5 a} = \frac{2 \cdot 7}{2 \cdot 5}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.1.2.2.3

Rewrite the expression.

$\frac{4 c}{5 a} = \frac{7}{5}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$\frac{4 c}{5 a} = \frac{7}{5}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$\frac{4 c}{5 a} = \frac{7}{5}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$\frac{4 c}{5 a} = \frac{7}{5}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.2

Multiply the numerator of the first fraction by the denominator of the second fraction. Set this equal to the product of the denominator of the first fraction and the numerator of the second fraction.

$4 c \cdot 5 = 5 a \cdot 7$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3

Solve the equation for $c$ .

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Step 1.3.1

Simplify.

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Step 1.3.1.1

Multiply $5$ by $4$ .

$20 c = 5 a \cdot 7$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.1.2

Multiply $7$ by $5$ .

$20 c = 35 a$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$20 c = 35 a$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.2

Divide each term in $20 c = 35 a$ by $20$ and simplify.

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Step 1.3.2.1

Divide each term in $20 c = 35 a$ by $20$ .

$\frac{20 c}{20} = \frac{35 a}{20}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.2.2

Simplify the left side.

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Step 1.3.2.2.1

Cancel the common factor of $20$ .

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Step 1.3.2.2.1.1

Cancel the common factor.

$\frac{20 c}{20} = \frac{35 a}{20}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.2.2.1.2

Divide $c$ by $1$ .

$c = \frac{35 a}{20}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{35 a}{20}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{35 a}{20}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.2.3

Simplify the right side.

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Step 1.3.2.3.1

Cancel the common factor of $35$ and $20$ .

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Step 1.3.2.3.1.1

Factor $5$ out of $35 a$ .

$c = \frac{5 (7 a)}{20}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.2.3.1.2

Cancel the common factors.

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Step 1.3.2.3.1.2.1

Factor $5$ out of $20$ .

$c = \frac{5 (7 a)}{5 (4)}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.2.3.1.2.2

Cancel the common factor.

$c = \frac{5 (7 a)}{5 \cdot 4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 1.3.2.3.1.2.3

Rewrite the expression.

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$c d = \frac{7}{10}$

Step 2

Solve the equation for $d$ .

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Step 2.1

Combine $\frac{7 a}{4}$ and $d$ .

$\frac{7 a d}{4} = \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.2

Multiply both sides of the equation by $\frac{4}{7}$ .

$\frac{4}{7} \cdot \frac{7 a d}{4} = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3

Simplify both sides of the equation.

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Step 2.3.1

Simplify the left side.

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Step 2.3.1.1

Simplify $\frac{4}{7} \cdot \frac{7 a d}{4}$ .

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Step 2.3.1.1.1

Cancel the common factor of $4$ .

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Step 2.3.1.1.1.1

Cancel the common factor.

$\frac{4}{7} \cdot \frac{7 a d}{4} = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.1.1.1.2

Rewrite the expression.

$\frac{1}{7} \cdot (7 a d) = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$\frac{1}{7} \cdot (7 a d) = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.1.1.2

Cancel the common factor of $7$ .

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Step 2.3.1.1.2.1

Factor $7$ out of $7 a d$ .

$\frac{1}{7} \cdot (7 (a d)) = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.1.1.2.2

Cancel the common factor.

$\frac{1}{7} \cdot (7 (a d)) = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.1.1.2.3

Rewrite the expression.

$a d = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = \frac{4}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.2

Simplify the right side.

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Step 2.3.2.1

Simplify $\frac{4}{7} \cdot \frac{7}{10}$ .

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Step 2.3.2.1.1

Cancel the common factor of $2$ .

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Step 2.3.2.1.1.1

Factor $2$ out of $4$ .

$a d = \frac{2 (2)}{7} \cdot \frac{7}{10}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.2.1.1.2

Factor $2$ out of $10$ .

$a d = \frac{2 \cdot 2}{7} \cdot \frac{7}{2 \cdot 5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.2.1.1.3

Cancel the common factor.

$a d = \frac{2 \cdot 2}{7} \cdot \frac{7}{2 \cdot 5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.2.1.1.4

Rewrite the expression.

$a d = \frac{2}{7} \cdot \frac{7}{5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = \frac{2}{7} \cdot \frac{7}{5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.2.1.2

Cancel the common factor of $7$ .

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Step 2.3.2.1.2.1

Cancel the common factor.

$a d = \frac{2}{7} \cdot \frac{7}{5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.2.1.2.2

Rewrite the expression.

$a d = 2 (\frac{1}{5})$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = 2 (\frac{1}{5})$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.3.2.1.3

Combine $2$ and $\frac{1}{5}$ .

$a d = \frac{2}{5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = \frac{2}{5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = \frac{2}{5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$a d = \frac{2}{5}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.4

Divide each term in $a d = \frac{2}{5}$ by $a$ and simplify.

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Step 2.4.1

Divide each term in $a d = \frac{2}{5}$ by $a$ .

$\frac{a d}{a} = \frac{\frac{2}{5}}{a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.4.2

Simplify the left side.

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Step 2.4.2.1

Cancel the common factor of $a$ .

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Step 2.4.2.1.1

Cancel the common factor.

$\frac{a d}{a} = \frac{\frac{2}{5}}{a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.4.2.1.2

Divide $d$ by $1$ .

$d = \frac{\frac{2}{5}}{a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$d = \frac{\frac{2}{5}}{a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$d = \frac{\frac{2}{5}}{a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.4.3

Simplify the right side.

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Step 2.4.3.1

Multiply the numerator by the reciprocal of the denominator.

$d = \frac{2}{5} \cdot \frac{1}{a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

Step 2.4.3.2

Multiply $\frac{2}{5}$ by $\frac{1}{a}$ .

$d = \frac{2}{5 a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$d = \frac{2}{5 a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$d = \frac{2}{5 a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$

$d = \frac{2}{5 a}$

$c = \frac{7 a}{4}$

$b = \frac{4}{5 a}$