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kenny6666 [7]
3 years ago
14

Carlos read 144 pages in 3 hours. His little sister read 24 pages in 1 hour. carlos's average reading rate is what percent of hi

s sisters average rate?
A) 7.5%
B) 50%
C) 75%
D) 200%
Mathematics
2 answers:
GalinKa [24]3 years ago
8 0
The correct answer should be D because it is double his sisters reading speed.
ehidna [41]3 years ago
3 0
Hello! So Carlos' sister reads an average of 24 pages in 1 hour. He reads 144 pages in 3 hours. To find the unit rate Carlos reads, let's do some division. 144/3 is 48. Carlos reads an average of 48 pages in 1 hour. If you use mental math, 48 is double the amount of 24. 200% is just simply 2. 24 * 2 is 48. D is the only one that shows an answer that even fits for this scenario. Carlos' average reading rate is 200% of his sister's. The answer is D: 200%.
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We can solve this problem using discriminant.

x^2-4x-12's discriminant is

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This means that it crosses over the axes 2 times.

In case you don't know what discriminant is, its in equation ax^2+bx+c

the discriminant is b^2-4ac.

If its positive it has 2 crosses with x axis, if negative then 0 crosses, if 0 then 1 cross.

Hope this helped at least a little bit :D

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Igoryamba

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2 years ago
Read 2 more answers
Are these answers right Or wrong
uysha [10]
They are right except for 12. i think it is C but i could be wrong.
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