**Answer:**

12/x hours

**Step-by-step explanation:**

d=12

s*t=d

t=d/s

t=12/s

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**Answer:**

it will change by 8 dollers

**Step-by-step explanation:**

**Answer:**

538

**Step-by-step explanation:**

if you round the hundreth place up, the tenth place would be 1. However, rounding that would give you 0 as it's less than 5. Therefore, all decimal places would become 0, and that only leaves 538.

**Answer:**

H

**Step-by-step explanation:**

Breaking the pencil into four equal pieces also means splitting the pencil into 4 groups of equal mass, so that means each piece would have a mass of 8/4 = 2 grams.