Which statement is true about the extreme value of the given quadratic equation? y = -3x2 + 12x − 33

The equation has a maximum value with a y-coordinate of -21.

Step-by-step explanation:

Given

Required

The true statement about the extreme value

First, write out the leading coefficient

means that the function would be a downward parabola;

Downward parabola always have their vertex on top of the parabola and as such, the function has a maximum value.

The maximum value is:

Where:

So, we have:

Substitute in

Hence, the maximum is -21.

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.