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Multiply & Divide Rational Numbers Quick Check

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Question
Use the properties of operations and rules for multiplying and dividing to solve:

(−2)×(1/5)÷(2/3)×(−5/6)÷(3/4)

(1 point)
Responses

1/6
Start Fraction 1 over 6 End Fraction

−1/6
negative Start Fraction 1 over 6 End Fraction

−2/3
negative Start Fraction 2 over 3 End Fraction

2/3

9 answers

To solve the expression \((-2) \times \left(\frac{1}{5}\right) \div \left(\frac{2}{3}\right) \times \left(-\frac{5}{6}\right) \div \left(\frac{3}{4}\right)\), we can follow the order of operations and simplify step by step.

  1. First, rewrite the expression to make it clear: \[ (-2) \times \left(\frac{1}{5}\right) \times \left(\frac{3}{2}\right) \times \left(-\frac{5}{6}\right) \times \left(\frac{4}{3}\right) \] (Note: Dividing by a fraction is equivalent to multiplying by its reciprocal.)

  2. Now, simplify it step by step: \[ (-2) \times \left(-\frac{5}{6}\right) = \frac{10}{6} = \frac{5}{3} \]

  3. Next, multiply by \(\frac{1}{5}\): \[ \left(\frac{5}{3}\right) \times \left(\frac{1}{5}\right) = \frac{5}{15} = \frac{1}{3} \]

  4. Now, multiply by \(\frac{3}{2}\) next: \[ \left(\frac{1}{3}\right) \times \left(\frac{3}{2}\right) = \frac{1}{2} \]

  5. Finally, multiply by \(\frac{4}{3}\): \[ \left(\frac{1}{2}\right) \times \left(\frac{4}{3}\right) = \frac{4}{6} = \frac{2}{3} \]

So, the result of the expression \((-2) \times \left(\frac{1}{5}\right) \div \left(\frac{2}{3}\right) \times \left(-\frac{5}{6}\right) \div \left(\frac{3}{4}\right)\) is:

\(\frac{2}{3}\)

The answer is \(2/3\).

Use the properties of operations and rules for multiplying and dividing to solve:

(9)÷(5/4)×(7/9)×(−5)÷(7/2)

(1 point)
Responses

−1,2258
negative Start Fraction 1,225 over 8 End Fraction

1,2258
Start Fraction 1,225 over 8 End Fraction

8
/8

−8

To solve the expression \(9 \div \left(\frac{5}{4}\right) \times \left(\frac{7}{9}\right) \times (-5) \div \left(\frac{7}{2}\right)\), we can follow the order of operations step by step and simplify.

  1. Rewrite the expression: \[ 9 \div \left(\frac{5}{4}\right) \times \left(\frac{7}{9}\right) \times (-5) \div \left(\frac{7}{2}\right) \]

  2. Convert division by a fraction into multiplication by its reciprocal: \[ 9 \times \left(\frac{4}{5}\right) \times \left(\frac{7}{9}\right) \times (-5) \times \left(\frac{2}{7}\right) \]

  3. Now calculate the multiplication step by step:

    • First, multiply \(9\) by \(\frac{4}{5}\): \[ 9 \times \frac{4}{5} = \frac{36}{5} \]

    • Next, multiply by \(\frac{7}{9}\): \[ \frac{36}{5} \times \frac{7}{9} = \frac{36 \times 7}{5 \times 9} = \frac{252}{45} = \frac{28}{5} \] (Simplifying \(\frac{252}{45}\) gives us \(\frac{28}{5}\) since both numerator and denominator can be divided by 9.)

    • Then multiply by \(-5\): \[ \frac{28}{5} \times (-5) = \frac{28 \times -5}{5} = -28 \]

    • Finally, multiply by \(\frac{2}{7}\): \[ -28 \times \frac{2}{7} = \frac{-28 \times 2}{7} = \frac{-56}{7} = -8 \]

So the result of the expression \(9 \div \left(\frac{5}{4}\right) \times \left(\frac{7}{9}\right) \times (-5) \div \left(\frac{7}{2}\right)\) is:

\(-8\)

The answer is \(-8\).

Solve this multi-step problem. A runner completes 14 of a 5-mile race every 8 minutes. At the same pace, how far can the runner go in 16 minutes?(1 point)

Responses

2 1/2 miles
2 Start Fraction 1 over 2 End Fraction miles

1/8 mile
Start Fraction 1 over 8 End Fraction mile

160 miles
160 miles

1/10 mile

To determine how far the runner can go in 16 minutes at the same pace, we first need to calculate the runner's speed in terms of miles per minute.

  1. Determine the distance covered in 8 minutes:

    • The runner completes 14% of a 5-mile race in 8 minutes.
    • First, calculate 14% of 5 miles: \[ 5 \text{ miles} \times 0.14 = 0.7 \text{ miles} \]

    So, in 8 minutes, the runner covers 0.7 miles.

  2. Calculate the runner's speed in miles per minute:

    • If the runner covers 0.7 miles in 8 minutes, the speed is: \[ \text{Speed} = \frac{0.7 \text{ miles}}{8 \text{ minutes}} = 0.0875 \text{ miles per minute} \]
  3. Determine the distance that can be covered in 16 minutes:

    • To find out how far the runner can go in 16 minutes, we set up the following equation: \[ \text{Distance} = \text{Speed} \times \text{Time} = 0.0875 \text{ miles/minute} \times 16 \text{ minutes} \]

    Calculating that gives: \[ \text{Distance} = 0.0875 \times 16 = 1.4 \text{ miles} \]

  4. Convert 1.4 miles to a mixed number:

    • \(1.4\) miles can be expressed as: \[ 1 \frac{2}{5} \text{ miles} \]

From the options provided, there is no exact match for 1.4 miles listed, but we can double-check our process or look at the given fractional miles closely.

Let's directly find a simpler approach through proportion.

  1. Using a proportion: Since in 8 minutes the runner covers \(\frac{7}{10}\) miles or \(0.7\), we can find how much is covered in 16 minutes:
    • Since \(16\) minutes is double \(8\) minutes, it will also be double the distance: \[ 0.7 \text{ miles} \times 2 = 1.4 \text{ miles} \]

Summary

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Let me know if more accurate determinations are needed.

so whats it as an mixed number

The distance the runner can cover in 16 minutes is 1.4 miles.

To convert 1.4 into a mixed number:

  1. Recognize that \(1.4\) is made up of \(1\) whole mile and \(0.4\) of a mile.
  2. To convert \(0.4\) into a fraction: \[ 0.4 = \frac{4}{10} \] Simplifying \(\frac{4}{10}\): \[ \frac{4 \div 2}{10 \div 2} = \frac{2}{5} \]

So, the mixed number representation of \(1.4\) miles is: \[ 1 \frac{2}{5} \text{ miles} \]

Thus, the distance the runner can cover in 16 minutes is \(1 \frac{2}{5}\) miles.

wrong pick 2 1/2 miles
2 Start Fraction 1 over 2 End Fraction miles

1/8 mile
Start Fraction 1 over 8 End Fraction mile

160 miles
160 miles

1/10 mile

I apologize for any confusion. Let's reassess the problem step by step to ensure we get the correct answer based on the given options:

Given Information:

  • A runner completes \( \frac{14}{100} \) of a 5-mile race every 8 minutes.

We need to determine how far the runner can go in 16 minutes.

Step 1: Find the distance covered in 8 minutes

  • The total distance of the race is 5 miles.
  • The runner completes \( \frac{14}{100} \) of the race in 8 minutes:

\[ \text{Distance in 8 minutes} = 5 \times \frac{14}{100} = 5 \times 0.14 = 0.7 \text{ miles} \]

Step 2: Find the distance covered in 1 minute

  • If the runner covers 0.7 miles in 8 minutes:

\[ \text{Distance per minute} = \frac{0.7 \text{ miles}}{8 \text{ minutes}} = 0.0875 \text{ miles per minute} \]

Step 3: Calculate the distance covered in 16 minutes

  • If the runner runs at 0.0875 miles per minute:

\[ \text{Distance in 16 minutes} = 0.0875 \times 16 = 1.4 \text{ miles} \]

Step 4: Convert 1.4 to a mixed number

  • We already know that \(1.4\) can be written as \(1\) whole mile and \(0.4\) of a mile.
  • As mentioned earlier, \(0.4\) can be expressed as a fraction:

\[ 0.4 = \frac{2}{5} \]

So, the mixed number is:

\[ 1 \frac{2}{5} \text{ miles} \]

Step 5: Reassess the comparison

Since you provided different response choices and requested to choose 2 1/2 miles or others, notice none of these responses directly relate though suggest distance might be incorrect contextually towards examined 0.7 previously noted through recalibrations:

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Final Answer

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