**Answer:**

A. fixed ratio

**Step-by-step explanation:**

Here worker is paid a fixed amount of $25 for every 20 chimes that she builds ( work quantity is also fixed). Therefore, the of reinforcement on which she is paid is** Fixed ratio. **In this schedule the reinforcement is done after a completion a fixed number of responses which 20 here. And in every cycle of reinforcement number of responses remain the same.

Can you please say how many snow globes there are so, we can give you an answer?

**Answer:**

The answer is 13

**Step-by-step explanation:**

**Answer:**

a = 60

b = 60

**Step-by-step explanation:**

We know that BC is 90°, because of the square thingy.

YB is 30°.

Now we do 180 - 30 - 90 = 60 (180 is the straight angle)

60 = b

Then a is the same.