santanabailey92 santanabailey92

21-08-2017
Mathematics

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An English instructor asserted that students' test grades are directly proportional to the amount of time spent studying. Lisa studies 9 hr for a particular test and gets a score of 72. At this rate, how many hours would she have had to study to get a score of 95?

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jdoe0001 jdoe0001

21-08-2017

[tex]\bf \begin{array}{ccll} hours&score\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 9&72\\ h&95 \end{array}\implies \cfrac{9}{h}=\cfrac{72}{95}\implies \cfrac{9\cdot 95}{72}=h[/tex]

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