1 :

Hint : 📈 Both variables increase

Correct Answers:

  • On a graph, the slope of the line segment between any two points would be positive.


Rationale :

📚 The table shows that as the distance increases, the winning time also increases, indicating a direct relationship.

📚 The distance is the independent variable (you choose it), and the winning time depends on the distance, so the statement that distance is dependent is incorrect.

📚 An inverse relationship means one variable increases while the other decreases, which is not the case here.

📚 A negative covariance would indicate that the variables move in opposite directions, but here they move together, so covariance is positive.

📚 Therefore, between any two points plotted on a graph, the slope (change in time/change in distance) is positive.


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2 :

Hint : ⚖️ Calories per slice constant

Correct Answers:

  • Each slice of cake is 480 calories.


Rationale :

🖋️ To find the calories per slice,

👉🏻 calculate the rate of change:

🖋️ Change in calories ÷ Change in slices = Calories per slice.

🖋️ Using values from the table: (960 - 0) calories ÷ (2 - 0) slices

▶️ = 480 calories per slice.

🖋️ This constant rate holds for other data points, confirming a direct linear relationship.

🖋️ The positive rate indicates more slices mean more calories with no negative or no relationship.


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3 :

Hint : 🧮Clear denominator first

Correct Answers:

  • -14


Rationale :

Let x be the unknown variable

Calculation:

↪️Multiply both sides by 5 to eliminate the denominator:

✓ −x + 36 = 10 × 5

✓ -x + 36 = 50

↪️Subtract 36 from both sides:

✓ −x = 50 − 36

✓ −x = 14

↪️Multiply both sides by -1 to solve for x

👉🏻x = −14


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4 :

Hint : 💵Add 15% tip

Correct Answers:

  • $49.68


Rationale :

📗 Total amount = Bill + Gratuity

📗 Bill amount = $43.20

📗 Gratuity = 15% of $43.20

📗 Calculate gratuity:

▶️Gratuity = 0.15 × 43.20 = 6.48

Total amount = 43.20 + 6.48

👉🏻 = 49.68


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5 :

Hint : 📉 Change ÷ original × 100

Correct Answers:

  • 10%


Rationale :

Formula:

✍️ Percent decrease = (P original − P new) ÷P original × 100%

Given:

♦️ Original price = 200,000 dollars

♦️ New price = 180,000 dollars

Calculation:

▶️ (200,000−180,000)÷200,000×100%

=0.1×100%

👉🏻 = 10%


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6 :

Hint : 🎇Use ratio relationships

Correct Answers:

  • 9


Rationale :

Formula:

✍️ TB = 2TA and TB = 3TC

Given:

♦️ Time for Pool C, TC = 6 hours

♦️ Pool B takes twice as long as Pool A: TB = 2TA

♦️ Pool B takes three times as long as Pool C:TB = 3 × 6 =18 hours

Calculation:

▶️ 18=2TA

▶️ TA = 18÷2

▶️ TA = 9 hours

👉🏻= 9 hours


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7 :

Hint : ✖️Multiply tape length by diameter

Correct Answers:

  • 16 inches


Rationale :

Formula:

✍️ Tape needed = Tape per inch × Tube diameter

Given:

♦️ Tape needed per inch diameter = 3.2 inches

♦️ Tube diameter D = 5D = 5D = 5 inches

Calculation:

▶️ Tape needed =3.2×5

▶️ Tape needed =16 inches

👉🏻= 16 inches


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8 :
  • 3/4
  • 5/7
  • 70%
  • 0.79

Hint : 📊 Convert all to decimals

Correct Order:

  • Order : 1 : No answer text available
  • Order : 2 : No answer text available
  • Order : 3 : No answer text available
  • Order : 4 : No answer text available

Rationale :

✍️Let's compare all values by converting them to decimals for easier ordering:

▶️ 3/4 ≈ 0.75

▶️5/7 ≈ 0.714

▶️70% ≈ 0.70

▶️0.79 (already decimal)

👉🏻= 70%, 5/7, 3/4, 0.79


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9 :

Hint : ⏰ Hours worked drives changes

Correct Answers:

  • Number of hours worked


Rationale :

❇️ The independent variable is the one that is changed or controlled to observe its effect.

❇️Here, the number of hours worked is the variable that changes and affects other factors.

❇️ The amount of taxes withheld, retirement savings withheld, and sick leave hours granted all depend on hours worked, so they are dependent variables.

❇️ Identifying the independent variable is crucial for understanding cause-and-effect relationships.

❇️Recognizing hours worked as independent helps clarify how employee benefits and deductions change.


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10 :

Hint : 🎓One up, other down

Correct Answers:

  • As the number of credit hours increases, the cost per credit hour decreases.


Rationale :

📚 An inverse relationship means that as one variable increases, the other decreases.

📚 If credit hours increase but the cost per credit hour decreases, the two variables move in opposite directions.

📚 When credit hours increase and cost per credit hour stays the same or increases, the relationship is not inverse.

📚 Understanding inverse relationships helps analyze pricing, discounts, or economies of scale.

📚 This scenario often applies to bulk discounts in tuition pricing.


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Total Questions: 10

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