4) Before a nation wide election, a polling
place was trying to see who would win.
Which choice best represents a sample?
A. A selection of voters over age 50.
B. A selection of male voters.
C. A selection of voters of different
ages.
D. All voters.

C.

Step-by-step explanation:

Not A. because that excludes people under the age of 50.

Not B. because that excludes females.

C. could be correct because it includes many different ages.

Not D. because all is not a sample.

the sum of all the angles in a triangle are equal to 180

so you can add   the 3 given angles together to equal 180:

5y + 2y + 2y = 180

or since all three angles have the same letter, combine the 3 angles to equal 180:

9y = 180