And cos B= For positive acute angles A and B, it is known that sin A= 11/61 and cos b= 9/41
Find the value of cos(A – B) in simplest form.

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

As a self-employed seamstress, you know that it takes 7 yards of material to make 3 jackets. you bought 15 yards of material to make 7 jackets. did you buy enough material? if not, how much were you over or under?

Name the property the equation illustrates 7+(4+4)=(7+4)+4