**The answers are shorter, higher, 2cm, 15cm, 20% and 15%.**

**Step-by-step explanation:**

**Step 1;** From the given data Hugo measured his plant higher than its original height. Hugo measured his plant as 12 cm while it was actually 10 cm. So **Hugo's measurement was off by 2cm**. Hugo's percent error is given by dividing the difference in values by the actual value.= multiplied by 100.

**% error = (difference in values / actual value) × 100**

**Hugo's % error = (12 - 10)/ 10 × 100 = 2/10 × 100 = 20%.**

**Step 2;** Koby measured his plant lower than his plant's original height. He measured it to be 85 cm while it was 100 cm tall. So **Koby's measurement was off by 15cm**. The percent error is calculated in the same way.

**% error = (difference in values / actual value) × 100**

**Koby's % error = (100 - 85)/ 100 × 100 = 15/100 × 100 = 15%.**

**Step 3;** Hugo had a percent error of 20% while Koby has a percent error of 15%. So **Hugo had a higher percent error** of the two.