Which equation does the graph of the systems of equations solve? a) x2 − 2x − 1 = −x2 + 3 b) x2 − 2x + 3 = x2 − x + 1 c) −x2 − 2x + 2 = 2x2 − x − 2 d) −x2 − 2x + 1 = 2x2 − x + 2

Answer :

x - 2 =0 and 2x + 2 =0

x = 2 and x= -1

At intersection points the x values are -1 and 2

that satisfies our graph.

answer: 2x + 2 − 2 = 10 − 2; subtraction property of equality

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.