Combine like terms 3x2-5x2

-7x2-4x2

4x2+x+7+(2x2+3x+1)

3x2+x-12-7x2+9x+1

5x2+x+7-2x2+3x+1

3x3-x2+8-(x3+5x2+4x-7)

2x^2+5x+17

your welcome. : )

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.

40 x 50 = 2000

step-by-step explanation: