physics vectors help?10 points?

Fizza

New member
Q. Given that A= 2i(hat) + 3j(hat) and B= 3i(hat) - 4j(hat), find magnitude of C=A+B and D=3A-2B
for the above questiont the problem i am having is that value of cos theta is coming out to be negative when calculating dot product of A and B. please help and show the calculation steps i should take!
 
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