Find x in the image below. Simplify any radicals.

10

Step-by-step explanation:

x(x+80) = 30²

x²+80x=900

x²+80x-900=0

(x+90)(x-10) = 0

x= -90 or x= 10

x = 10 is the answer

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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.