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andreyandreev [35.5K]
3 years ago
11

Determine whether the parabola y = −x2 + 15x + 8 opens up, down, left, or right.

Mathematics
1 answer:
spayn [35]3 years ago
7 0
Dy/dx=-2x+15

d2y/dx2=-2

Since the acceleration is a constant negative it has an absolute maximum value for y(x), thus it opens downward, as x decreases without bound as x approaches ±∞
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The difference of two number is 3. Their sum is 13.<br> Find the numbers.
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Question 4 (1 point)
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The Answer to your question I believe is False…

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5 0
2 years ago
How fast is a train going that makes a 330 mile trip in 4 hours?
Elis [28]

ANSWER

The car moves at 32 mi/hr

EXPLANATION

This question is asking us to determine how fast is a train that makes 330 mile trip in 4 hours.

This is the same as calculating the speed of the train:

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6 0
3 years ago
Help please. I don't really understand.
aev [14]
Ok. 1/4 is 9/36 . you do this by seeing what will give you 36 when you have a 4 . and 9/9 when you divided both you get 0.25.

again we have 4/9 and we see what we can put in to get another 36 , but we have a 9, so it’s 4. 4/9 x 4/4 = 16/36 when you divide this you them both you get 0.44 so they’re equivalent.


so 0.25 is less than 0.44

basically it’s saying 25<44

so 1/4 is less than 4/9
6 0
3 years ago
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