Look at the figure below:

an image of a right triangle is shown with an angle labeled y

If sin y° = a over 6 and tan y° = a over b, what is the value of sec y°?

sec y° = b over 6
sec y° = 6a
sec y° = 6b
sec y° = 6 over b

cos yº=b/6

Step-by-step explanation:

Sin Ф=opposite / hypotenuse

tan Ф=opposite / adjacent.

cos Ф=adjacent /hypotenuse.

In this case:

sin yº=a/6

opposite=a

hypotenuse=6

tan yº=a/b

opposite=a

adjacent=b

cos yº= adjacent /hypotenuse=b/6

answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.