Which of the following is the simplified form of the expression 12z - 4y + 16z - 8y?

28z - 12y

Step-by-step explanation:

Considering you have the expression 12z - 4y + 16z - 8y, you can notice automatically that there are like terms. We also know that to simplify an expression, you need to combine like terms.

First, change all signs:

12z - 4y + 16z - 8y

12z + (-4y) + 16z + (-8y)

Second, place like terms next to each other:

12z + 16z + (-4y) + (-8y)

Third, combine like terms:

28z + (-12y)

28z - 12y

Considering these terms have different variables, you cannot simplify any farther.

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.