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Margaret [11]
3 years ago
11

Thank to whoever answers this

Mathematics
2 answers:
blagie [28]3 years ago
8 0
I’m pretty sure the answer is A, i hope this helps!!
Xelga [282]3 years ago
3 0

Answer:

Hi! Do you need any help with anything?

Step-by-step explanation:

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A student's cost for last semester at her community college was $2800. She spent $308 of that on books. What percent of last sem
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You want to divide the cost of the books by the total costs.

308/2800 = 0.11

You then need to convert 0.11 to a percent: 0.11 = 11%

Therefore, 11% of her costs last semester were spent on books.

That’s too much!
4 0
3 years ago
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Answer:

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Step-by-step explanation:

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Serga [27]
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answer
-a/b
8 0
3 years ago
Ending 7:43 elapsed time 37 minutes
Novosadov [1.4K]
Starting time:
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3 0
3 years ago
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If(a²-1) x²+(a-1)x+a²-4a+3=0 is an identity in x, then find the value of a​
PtichkaEL [24]

Answer:

Step-by-step explanation:

(a^2-1)x^2+(a-1)x+a^2-4a+3=0\\\\Calculate\ and\ identify\ the\ polynomials\\\\\Longleftrightarrow\ a^2x^2-x^2+ax-x+a^2-4a+3=0\\\\\Longleftrightarrow\ a^2x^2+ax+a^2-4a+3=x^2+x+0\\\\\Longleftrightarrow\ \left\{\begin{array}{ccc}a^2&=&1\\a&=&1\\a^2-4a+3&=&0\\\end{array} \right.\\\\\Longleftrightarrow\ \left\{\begin{array}{ccc}(a-1)(a+1)&=&0\\a-1&=&0\\(a-1)(a-3)&=&0\\\end{array} \right.\\\\\\We\ must\ exclude\ a=-1\ and\ a=3\ (not\ solution)\\\Longrightarrow\ a=1\\

6 0
2 years ago
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