A parabola opens down if the value of is negative in the general form of the equation.
2 answers:
Answer:
The answer is the negative value of "a".
Step-by-step explanation:
In order to determine the answer, we have to know about the general form of the quadratic function.
The general form is:
where a , b and c are real numbers and a not equal to zero.
I have attached an image that shows the general graph of the quadratic function. We can see that:
- If the value of "a" is positive, the parabola opens up.
- If the value of "a" is negative, the parabola opens down.
It depends on the coefficient next to the quadratic variable.
Finally, the negative value of "a" makes that the parabola opens down.
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Answer:
2nd debate was 3 hours long.
Step-by-step explanation:
We have been given that during the mayoral election,two debates were held between the candidates. The first debate lasted 1 2/3 hours. The second one was 1 4/5 times as long as the first one.
Let us find the estimate of time spent on 2nd debate.
1 2/3 hours would be approximately 2 hours. 1 4/5 times would be equal to 2 times.
Therefore, the estimated time is less 4 hours.
To find the time spent on 2nd debate, we will multiply 1 2/3 by 1 4/5.
First of all, we will convert mixed fractions into improper fractions as:
Now, we will multiply both fractions as:
Therefore, the 2nd debate was 3 hours long.