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Katena32 [7]
2 years ago
6

Please provide an answer that's simple and concise then provide an explanation if available

Mathematics
1 answer:
Liono4ka [1.6K]2 years ago
3 0

Answer:

C

Step-by-step explanation:

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Please find which quadratic equation matches the graph with work attached
lesya [120]

Answer:

C

Step-by-step explanation:

Firstly, we know that the function must be negative due to its shape. This means that the answer cannot be B

Next we can use the equation x=\frac{-b}{2a} that is used in order to find the vertex of the parabola.

A)

f(x)=-x^2+6x+7\\a=-1,b=6,c=7\\\\x=\frac{-6}{-2} \\x=3

As the vertex is at x=3 on the graph, this one could be a contender.

C)

f(x)=-x^2+6x-7\\a=-1,b=6, c=-7\\\\x=\frac{-6}{-2} \\\\x=3

This also could be the equation

D)

f(x)=-x^2-6x-7\\\\a=-1, b=-6, c=-7\\\\x=\frac{6}{-2} \\\\x=-3

This rules option D out.

For this last step, we can look at where the zeroes would be for each equation. (These values are irrational, so we cannot look at specific number)

A)

f(x)=-(x^2-6x-7)

As this equation has a negative value for c, this means that one zero must be positive and the other must be negative.

This means that option A can be ruled out

C)

f(x)=-(x^2-6x+7)

As this equation has a positive value for c, this means that both of the zeroes must be positive. This means that it is the only one that fits all of the criteria.

7 0
3 years ago
The sum of1/2 and 1/5 is between 1/2 and 1?
KATRIN_1 [288]

Answer:

the answer is 7/10, and yes it is between a whole and a half because 7/10 is over 1/2 but less that a whole.

5 0
3 years ago
Suppose you buy lunch for the drama club. You have enough money to buy 20 salads and 15 sandwiches. The group wants 12 sandwiche
bixtya [17]
You can buy 23 salads because the group wants 12 instead of 15 15-12=3
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Answer:

3670

Step-by-step explanation:

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I was sick the day that the class went over how to do this and I don’t know how to do it.
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You first need to know the equation A=pi x r^2. The equation you need for this problem is pi (3.14) x 3^2
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