6. Bobby has a sister named Abbey. Bobby's sister Abbey is 4 years older than of Bobby's age.

a) Write an expression for Abbey's age in terms of Bobby's age, b.

b) How old is Bobby if Abbey is 7 years old?

c

step-by-step explanation:

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.

step-by-step explanation:

what is the figure? attach a picture.