Which expression is equivalent to the one below? check all that apply. 81x
a. (9•9)^x
b. 9•9^2x
c. 9^x•9^x
d. 9^2•9^x
e. 9•9^x
f. 9^2x

The correct options are A ,C and F.

Step-by-step explanation:

The given expression is

Calculate the simplified form of given options.

A.

B.

C.

D.

E.

F.

Therefore  correct options are A ,C and F.

15

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.