**Answer:**

The answer is B

**Step-by-step explanation:**

You add up all the numbers which should be 600 and divide by the total amount numbers used.

600/15=40.

**Answer:**

she shouldn't adjust the compass width.

**Answer:**

9v-18

**Step-by-step explanation:**

.........................................

**Answer:**

c=1.96

**Step-by-step explanation:**

2.1/c=1.5/1.4

2.1*1.4=1.5*c

2.94/1.5=1.5c/1.5

c=1.96