College

4. Your instructor makes 5 cents per minute. How much does he make in dollars if he works for 40 hours?

5. This past April in Charleston, IL, it rained 0.005 inches per minute. If it rained for 5 hours, how many inches of water fell?

6. Grace walked 20 inches in 1 second. What is her rate of speed in kilometers per day?

7. A snail moves 0.05 millimeters in a second. What is its rate of speed in inches per hour?

8. A rock can roll downhill 1 inch in 1 minute. How far will it roll in meters if it rolls continuously for 100 hours?

9. You have a house that measures 96 feet × 137 feet. How many square meters is that? (Be careful and watch your units)

RT 2: SCIENTIFIC NOTATION

Answer :

Sure! Let's go through each question one by one and find the solutions:

### Question 4
Problem: Your instructor makes 5 cents per minute. How much does he make in dollars if he works for 40 hours?

Steps:
1. First, calculate the total number of minutes in 40 hours.
- [tex]\( 40 \, \text{hours} \times 60 \, \text{minutes per hour} = 2400 \, \text{minutes} \)[/tex]

2. Calculate the total earnings in cents.
- [tex]\( 2400 \, \text{minutes} \times 5 \, \text{cents per minute} = 12000 \, \text{cents} \)[/tex]

3. Convert the earnings from cents to dollars.
- [tex]\( \frac{12000 \, \text{cents}}{100 \, \text{cents per dollar}} = 120.00 \, \text{dollars} \)[/tex]

### Question 5
Problem: This past April in Charleston, IL, it rained 0.005 inches per minute. If it rained for 5 hours, how many inches of water fell?

Steps:
1. Calculate the total number of minutes in 5 hours.
- [tex]\( 5 \, \text{hours} \times 60 \, \text{minutes per hour} = 300 \, \text{minutes} \)[/tex]

2. Calculate the total rainfall in inches.
- [tex]\( 300 \, \text{minutes} \times 0.005 \, \text{inches per minute} = 1.5 \, \text{inches} \)[/tex]

### Question 6
Problem: Grace walked 20 inches in 1 second. What is her rate of speed in kilometers per day?

Steps:
1. Convert inches to meters.
- [tex]\( 20 \, \text{inches} \times 0.0254 \, \text{meters per inch} = 0.508 \, \text{meters per second} \)[/tex]

2. Convert meters to kilometers.
- [tex]\( 0.508 \, \text{meters per second} \times 0.001 \, \text{kilometers per meter} = 0.000508 \, \text{kilometers per second} \)[/tex]

3. Calculate speed in kilometers per day.
- [tex]\( 0.000508 \, \text{kilometers per second} \times 86400 \, \text{seconds per day} = 43.8912 \, \text{kilometers per day} \)[/tex]

### Question 7
Problem: A snail moves 0.05 millimeters in a second. What is its rate of speed in inches per hour?

Steps:
1. Convert millimeters to inches.
- [tex]\( 0.05 \, \text{millimeters} \times 0.0393701 \, \text{inches per millimeter} = 0.001968505 \, \text{inches per second} \)[/tex]

2. Calculate speed in inches per hour.
- [tex]\( 0.001968505 \, \text{inches per second} \times 3600 \, \text{seconds per hour} = 7.086618 \, \text{inches per hour} \)[/tex]

### Question 8
Problem: A rock can roll downhill 1 inch in 1 minute. How far will it roll in meters if it rolls continuously for 100 hours?

Steps:
1. Calculate the total number of minutes in 100 hours.
- [tex]\( 100 \, \text{hours} \times 60 \, \text{minutes per hour} = 6000 \, \text{minutes} \)[/tex]

2. Calculate total roll distance in inches.
- [tex]\( 6000 \, \text{minutes} \times 1 \, \text{inch per minute} = 6000 \, \text{inches} \)[/tex]

3. Convert inches to meters.
- [tex]\( 6000 \, \text{inches} \times 0.0254 \, \text{meters per inch} = 152.4 \, \text{meters} \)[/tex]

### Question 9
Problem: You have a house that measures 96 feet by 137 feet. How many square meters is that?

Steps:
1. Calculate the area in square feet.
- [tex]\( 96 \, \text{feet} \times 137 \, \text{feet} = 13152 \, \text{square feet} \)[/tex]

2. Convert square feet to square meters. (1 square foot = 0.092903 square meters)
- [tex]\( 13152 \, \text{square feet} \times 0.092903 \, \text{square meters per square foot} = 1221.86078208 \, \text{square meters} \)[/tex]

These calculations give us the answers to the questions as requested!