The double implication "if and only if" is graphically represented by an arrow pointing in both direction, so the correct writing is

4.12 rounded to the nearest tenth is 4.1
Answer:
0.0000001 (one ten millionth)
Step-by-step explanation:
Answer:
B) 12p - 10
Step-by-step explanation:
J = 3p
A = 2(3p) = 6p
S = 3p - 10
add together:
3p + 6p + 3p - 10 = 12p - 10
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