
<h2>
Explanation:</h2>
The vertex form of the equation of a parabola is given by the following form:

In this exercise, we have the following equation:

From here, we can conclude that:

Since the leading coefficient is less than zero, the parabola open downward. So, the graph is shown below and the vertex has been indicated.
<h2>Learn more:</h2>
Finding leading coefficient: brainly.com/question/1469367
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.87 is correct you can always check your work with an online calculator. :)
Answer:no it is not
Step-by-step explanation: A rational number is a repeating number. This is a terminating number.