Study on arithmetic abilities of SUTD Students

We are a group of students from 02.218 Introduction to Psychology doing our Research Project on the arithmetic abilities of students in SUTD. Thank you for taking the time to do this research study, the top 10 best performing participants will be rewarded for their effort.
 
Please fill in your name and email so we can contact the winners.
We are a group of students from 02.218 Introduction to Psychology doing our Research Project on the arithmetic abilities of students in SUTD. Thank you for taking the time to do this research study, the top 10 best performing participants will be rewarded for their effort.
 
Please fill in your name and email so we can contact the winners.
Name
Email Address
By clicking next, I agree to allow the data collected in this study to be used anonymously for research purposes.
By clicking next, I agree to allow the data collected in this study to be used anonymously for research purposes.
3x2 - 39x = 3x - 8 + x2
x > 0
 
Solve for x.
7
3
4
13
6a + b = -5 - 3c
5b -3c = 28 - 7a
5c = 6 + 2a + 2b

Solve for c.
-3
-1
6
12
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