Solution: How many such combinations are possible?

Solution: How many different ways can 5 boys and 5 girls form a circle?

Solution: In how many ways can you invite one or more of your five friends?

Solution: Is the survey worth paying for?

Solution: At what rate is the current changing at the instant when the resistance is 6 ohms?

Solution: What is the allowable error in measuring the edge of the cube?

Solution: What is the deep of the water in a hemispherical bowl?

Solution: How fast in kph is the distance between the two trains changing at 4:00 PM?

Solution: Find how (in kph) fast the two cars are separating at 4:00 PM?

Solution: How fast is the distance between car A and car B separating after one hour?