Do it for da brainliest >:)

8 + 20s

Step-by-step explanation:

2 × 4 = 8

2× 10s = 20s

8 + 20s

It should be 28s unless S is a number

Step-by-step explanation:

Do inside the parentheses 4 + 10 and get 14. Multiplay that by 2 to get 28. Then add your variable and get 28s

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.