To find f(-20), first figure out which piece x = -20 fits with.
Since -20 < -12, x = -20 first in the domain used by the third piece.
For f(-20), treat this function as if it was just f(x) = 3x-7.
f(-20) = 3(-20) -7
= -60 - 7
= -67
Answer:
D
Step-by-step explanation:
Because it's 340 meters per second
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10 or 70
10= 40-30=10
70=40+30=70
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