Remember that x =r cos theta and y = r sin theta. Thus,
x + y = r (cos theta + sin theta) = 4, or
r (cos theta + sin theta) = 4, or
4
r = -------------------------------
cos theta + sin theta
90% = 90/100 = 9/10 = 0.9
Hope this helps :)
Answer:
this is not enough information
Number of yellow envelopes is 13-11 =2
Blue is 13
Green is 2*3 =6 so add the totals
2+6+13 which is 21
