If Sin is 11/20
What is Cos?

If Sin is 11/20

What is Cos?

COS is 59/20

Step-by-step explanation:

from trigonometry basics we have SOH CAH TOA

SOH means sine = opp/hypo

CAH means  cos = adj/ hypo

TOA  means tan = opp/ adj

in a right angle triangle the sum of sides is equal to 90degree

if  sine = 11/20 the it means the the opposite(OPP) = 11 while the Hypotenus side(Hyp) = 20

then we have to find our adjacent , 11+20+ adj= 90

31+ adj =90

adj = 90-31

adj= 59

therfore, COS = ADJ/HYP

COS= 59/20

the equation for this situation is y=122+45. to solve the equation you would add 45 and 122 to get a total of 167lbs. in conclusion, grace's weight eight weeks ago was 167lbs.  

24 units

step-by-step explanation: