Answer=26
65students
40%=0.40
65*0.40=26
26 students bought Einstein shirts.
Start with
as a template for the vector . Its magnitude is 4, so
Its component in the direction is twice the component in the direction, which means
So we have
and
Lastly, rationalize the denominator:
So we end up with two possible answers,
2x^2 -6x -2+x^2+4x
All you have to do is add like terms
2x^2+x^2
= 3x^2
-6x+4x
= -2x
Then add them together to get one equation
3x^2 -2x -2
I recommend you study how to add variables as these are very basic sums. Just practice :)
-6.5 is the answer! Have a good day:)