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ElenaW [278]
3 years ago
14

It is almost the end of the grading period. I have 730 out of 880 points so far in my math class which means I currently have a

B (83%). There are 90 points remaining before grades come out. My teacher rounds each student's score to the nearest percent. What is the fewest number of points I need to get and end up with a grade of...
C (at least 70%)?_____
B (at least 80%)?_____
A (at least 90%)?_____

Plz help me figure this out

Mathematics
2 answers:
maksim [4K]3 years ago
7 0
What is being asked here? Are they asking for the passing grade or the total with all the other 90 points added? I think it is A, 90%
ipn [44]3 years ago
4 0
616 for a 70%, 704 for an 80%, and 792 for a 90%
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Find the vertex, focus, directrix, and focal width of the parabola. (5 points)
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\bf -\cfrac{1}{20}x^2=y\implies \cfrac{x^2}{-20}=y\implies x^2=-20y\implies (x-0)^2=-20(y-0) \\\\\\ (x-\stackrel{h}{0})^2=4(\stackrel{p}{-5})(y-\stackrel{k}{0})

something noteworthy is that the squared variable is the "x", thus the parabola is a vertical one, the "p" value is negative, so is opening downwards, and the h,k is pretty much the origin,

vertex is at (0,0)

the focus point is "p" or 5 units down from there, namely at (0, -5)

the directrix is "p" units on the opposite direction, up, namely at y = 5

the focal width, well, |4p| is pretty much the focal width, in this  case, is simply yeap, you guessed it, 20.

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