9. if four times a number plus 3 is 11, what is the number?

The number is 2.

Step-by-step explanation:

Let the number be x, then:

4x + 3 = 11

4x = 11 - 3

4x = 8

x = 8/4

= 2.

17   x 256=4352

sorry if this is wrong, i'm new.

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.