On the first practice day, Valterri is able to complete 21 laps in 1 hour, 13 minutes, and 30 seconds. What is Valterri’s unit rate for Day 1, in minutes per lap?

Valterri's unit rate for Day 1 in minutes per lap is 3.5 or 3 minutes and 30 seconds.

Step-by-step explanation:

Let's find Valterri's unit rate for Day 1 in minutes per lap, this way:

Total time = 1 hour, 13 minutes, and 30 seconds

Total time = 60 minutes + 13 minutes + 30 seconds

Total time = 73 minutes and 30 seconds

Total time = 73.5 minutes (30 seconds = 0.5 minutes)

Number of laps = 21

Valterri's unit rate for Day 1 in minutes per lap = Total time/Number of laps

Valterri's unit rate for Day 1 in minutes per lap = 73.5/21

Valterri's unit rate for Day 1 in minutes per lap = 3.5

then, the surface area of the sphere shown in the image is: 256π sq. units!

step-by-step explanation:

the lateral surface area of a sphere is 2πrh where h=2r.

then:

surface area = 4πr^2.

in this case, r=8 units ⇒ surface area = 4π(8 units)^2. = 256π sq. units!

then, the surface area of the sphere shown in the image is: 256π sq. units!