# Math

posted by .

Lee has two tests to study for: Chemistry and French. She plans to study for up to 13h in total. She will spend at least 4 hours studying Chemistry and up to 6 hours studying French. Let x represent the number of hours she will spend studying Chemistry, and y the number of hours studying French. Which system of inequalities best represents this situation?

a) x+y</13, x>/4, y</6
b) x+y>/13, x<6, y>/4
c) xy</13, x>4, y<6
d) x+y</6+4, xy</13

• Math -

x+y <= 13, because she will spend up to 13 hours studying.

x >= 4, because she will spend at least 4 hours studying chemistry.

y <= 6, because she will spend up to 6 hours studying French.

You have to look at the keywords - "up to," "at least," to determine which inequality to use.

## Similar Questions

1. ### math

the least common multiple of 3, 6,9 i say 18 Sheila practiced hours Monday, hours Tuesday, and hours Wednesday. What is the total number of hours that she practiced?
2. ### French

Why is studying French important? Why do we study French in Canada?

Why is studying French important? Why do we study French in Canada?
4. ### Economics

Brian is taking three courses this semester: economics, statistics, and finance. He has decided to spend 19 hours per week studying (in addition to attending all his classes) and his objective is to maximize his average grade, which …
5. ### linear optimization

During a summer session a student enrolls in two courses, psychology for four hours and engineering for three hours. The student wants to use the available time to amass the largest number of grade points (numerical grade multiplied …
6. ### economic

10. Suppose, unfortunately , your mathematics and economics professors have decide to give tests 2 day from now and you can spend only a total of 12 hours studying for exams .After some thought, you conclude that dividend your study …
7. ### economic

Suppose, unfortunately , your mathematics and economics professors have decide to give tests 2 day from now and you can spend only a total of 12 hours studying for exams .After some thought, you conclude that dividend your study time …
8. ### Math

I studied for four hours. I added 2 more hours every day for a week. How many more days do I have to study until I have spend 20 hours studying?

The more you study for a certain exam, the better your performance on it. If you study for 10 hours, your score will be 65%. If you study for 20 hours, your score will be 95%.You can get as close as you want to a perfect score just …
10. ### Math

In a class the number of students who study French or Geography is 40, 20 study both subjects and the number that study French is 10 more than the number studying geography. Illustrate on a Venn diagram hme information above. How many …

More Similar Questions