3/5 is the answer. Difference means to subtract
-19 + (-12) = 7
Remove Parentheses
( -a ) = -a
= 19 - 12
Subtract The Numbers
19-12 = 7
Cone's volume is

where S - surface area, h - height
Surface area =

r = 18/2=9
h= 14
π = 3.14

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Answer:
im not 100% but i think its
T= 2t-4+(t-4)+7