Please double check

In a bottling company, a machine can fill a 2-liter (l) bottle in 0.5 second (s) and move the next bottle into place in 0.1 s. How many 2-l bottles can be filled by the machine in 2 h?
Answer: 1.00 or 0.20
A circular coffee table has a diameter of 5 ft. What will it cost to have the top refinished if the company charges $3 per square foot for the refinishing?
Answer: $75.00
0.52 divide by 3.2318
Answer: 6.22
Seven employees of an office donated a total of $172.06 during a charity drive. What was the average donation?
Answer: $24.58
Find the decimal equivalents for each of the following mixed numbers
20. 7 ¾
Answer: 7.75

Your last two look right, but let's look at the first two.

First, it's much easier if you have all of you units the same...so turn everything into seconds. We're looking for 2 hours. Since there are 60 sec in a minute and 60 minutes in an hour (times 2 hours), there will be 7200 seconds in 2 hours. It takes .6 seconds to fill one bottle and move the next into place. Therefore, you will divide 7200 by .6 to get your answer. You came up with either 1 or less. If your answer doesn't make sense it can't be right.
For the next question, you need to find the area of the surface of the table.
pi x r squared r=2.5
So, 2.5 x 2.5 x 3.14....take this answer and multiply by 3 to get your answer.

To double-check the answers, let's go through the calculations step by step.

1. Bottling Company:
The machine can fill a 2-liter bottle in 0.5 seconds and move the next bottle into place in 0.1 seconds. We need to find out how many 2-liter bottles can be filled by the machine in 2 hours.

To convert 2 hours into seconds, we multiply 2 by 60 (minutes in an hour) and then by 60 (seconds in a minute):
2 hours = 2 * 60 * 60 = 7200 seconds

Now, let's calculate how many bottles can be filled in 7200 seconds. First, we calculate the total time taken per bottle:
Time taken per bottle = Time to fill a bottle + Time to move the next bottle into place
Time taken per bottle = 0.5 seconds + 0.1 seconds = 0.6 seconds

To find the number of bottles filled in 7200 seconds, we divide the total time (7200 seconds) by the time taken per bottle (0.6 seconds):
Number of bottles filled = 7200 seconds / 0.6 seconds = 12000

So, the correct answer is 12000 bottles.

2. Circular Coffee Table:
The coffee table has a diameter of 5 feet. We need to find out the cost to have the top refinished if the company charges $3 per square foot for refinishing.

To find the area of the circular table, we use the formula for the area of a circle:
Area = π * r^2, where r is the radius of the circle.

First, we find the radius by dividing the diameter (5 feet) by 2:
Radius = 5 feet / 2 = 2.5 feet

Now, we can calculate the area of the circular table:
Area = π * (2.5 feet)^2
Area ≈ 3.14 * (2.5 feet)^2 ≈ 19.625 square feet

To find the cost of refinishing, we multiply the area (19.625 square feet) by the cost per square foot ($3):
Cost to refinish = 19.625 square feet * $3 = $58.875

Rounding to the nearest cent, the correct answer is $58.88.

3. Division:
To calculate 0.52 divided by 3.2318, we simply divide the two numbers:
0.52 / 3.2318 ≈ 0.160735014

Round this to two decimal places, the correct answer is approximately 0.16.

4. Average Donation:
Seven employees donated a total of $172.06. We need to find the average donation amount.

To calculate the average, we divide the total donation amount by the number of employees:
Average donation = $172.06 / 7 = $24.58

So, the correct answer is $24.58.

5. Decimal Equivalent of Mixed Number:
The mixed number given is 7 ¾. We need to find its decimal equivalent.

To do this, we convert the fraction to a decimal by dividing the numerator by the denominator:
Decimal equivalent = 7 + (7/4) = 7 + 1.75 = 8.75

So, the correct answer is 8.75.