True or false: spotting the variation

Exercise and reference answers

Questions

1. Statement is true

   Yes

   Statement

   Buying more kilograms raises the total cost proportionally.

2. Statement is true

   Yes

   Statement

   At a fixed speed, distance and time rise together.

3. Statement is true

   No

   Statement

   For a fixed distance, doubling the speed doubles the time.

4. Statement is true

   Yes

   Statement

   For a given job, more workers finish it sooner.

5. Statement is true

   No

   Statement

   Workers and time to finish rise together.

Explanation