Adult ticket (a) = $5
Child ticket (c) = $2
785 tickets = $3280
a + c = 785 tickets
5a + 2c = $3280
c = 215 child tickets
a = 570 adult tickets
570 + 215 = 785 tickets
5(570) + 2(215) = $3280
There were 215 child tickets sold on Saturday
Answer:
18
Step-by-step explanation:
24*.75=18
First you had to remove parenthesis first.

Multiply by the numbers.

Final answer 



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-Charlie
Answer is D You'll do the diameter squared then you multiply by π
180-2(55)-x=0
180-110-x=0
70-x=0
-x=-70
x=70°