Pi/3 is the reference angle for: a. 2pi/3 b. 15pi/3 c. 7pi/3 d. 19pi/3 **its choose all that ! : ) my answers: c. 7pi/3 and d. 19pi/3 are those right? ?

yes those are right but 2pi/3 is also right.

Step-by-step explanation:

The correct answers are A,C and D

Step-by-step explanation:

Given an angle θ, we call the reference angle for θ as '' θ ref ''.

Using the x-axis as our frame of reference, θ ref is always the smallest angle that you can make from the terminal side of an angle with the x-axis.

Let's note the quadrants of the IR2 as Q.

For an angle θ in QI, θ ref = θ

For an angle θ in QII, θ ref = π - θ

For an angle θ in QIII, θ ref = θ - π

For an angle θ in QIV, θ ref = 2π - θ

For A.

This angle is in QII ⇒ θ ref = π - θ

                                   θ ref = π - =

For B.

This angle is equal to

This angle is in QII ⇒ θ ref = π - θ

                                   θ ref = π - π = 0

For C.

This angle is equal to

This angle is in QI ⇒ θ ref = θ =

For D.

This angle is equal to

This angle is in QI ⇒ θ ref = θ =

The correct answers are A,C and D.

Notice that in the angles bigger than 2π we subtract multiples of 2π to know in which quadrants are the angles.

answer: a. 13/44

step-by-step explanation: judging by the information given to us, we are looking for experimental probability. we can see that 13 males have chosen chocolate ice cream. there are 44 ice creams in total (remember that the total is always the denominator). so our answer is 13/44.