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VMariaS [17]
3 years ago
10

Suppose the vertex of a parabola is in the first quadrant and the parabola opens upwards. What can be determined about the value

of a and the discriminant?
Mathematics
1 answer:
schepotkina [342]3 years ago
4 0
A parabola is the graph of a quadratic function, 

that is the graph of f(x)=a x^{2} +bx+c, where a is not 0.

from a, b and c we can derive the following informations about the shape of a parabola:

if a>0, the parabola opens upwards.
if a<0, the parabola opens downwards.

Consider the discriminant D= b^{2} -4ac

If D>0, the parabola intersects the x-axis at 2 points.
If D=0, the parabola intersects the x-axis at 1 point.
If D<0, the parabola does not intersect the x axis.

"<span>the vertex of a parabola is in the first quadrant and the parabola opens upwards.</span>"

the vertex is in the first quadrant means that the vertex is above the x-axis, and it opens upwards, so the parabola does not intersect the x-axis.

This means that:

Answer: a>0, the discriminant D<0
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Answer:

30-8p

Step-by-step explanation:

Let p represent cost of each drink.

We have been given that the medium pizza costs two times as much as one drink, so the cost of medium pizza would be 2p.

We are also told that the large pizza costs three times as much as one drink,  so the cost of la pizza would be 3p.

We have been given that Mary wants to buy one large pizza, one medium pizza, and three drinks.

Since the cost of one drink is p, so cost of 3 three drinks would be 3p.

The total cost of one large pizza, one medium pizza, and three drinks would be 2p+3p+3p=8p

Mary started with $30, so amount left after all of her purchases would be 30 minus total cost of all purchases.

30-8p

Therefore, Mary will have 30-8p dollars left after making all of her purchases.

4 0
2 years ago
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Answer:

Step-by-step explanation:

1. ok so you need to use Pythagoras which is a^2 + b^2 = c^2

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400 = c^2 (square root each side to get ride of the square)

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2. doing the same thing you get c = 22.36 in

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8 0
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dmitriy555 [2]

Answer:

a = 35

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Step-by-step explanation:

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therefore a = 35.

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2 years ago
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