Answer :

Answer:

A. 78

Step-by-step explanation:

2a+24= 180

-24          -24

2a= 156

divide each side by 2

a= 78

Answer:

a = 52 -- READ EXPLANATION, YOU WON'T BE PREPARED FOR A TEST WITHOUT IT.

Step-by-step explanation:

We know 2a + 24 is on one side of a diameter line, along with <a

to find out what it is,  we can do the equation (2a + 24) + a = 180

this would simplify as 3a + 24 = 180

180 - 24 = 156

156 / 3 = 52

so we now know that a = 52

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