Answer:
2.70
Step-by-step explanation:
they have different answers
X - 13 = 4 and 13 - X = 4
for x- 13 = 4
x=4+13=17
x=17
for 13 - x = 4
13-4-x=0
9-x=0
9=x
x=9
a) -5n9
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Answer- 85.7 g
300:7= 42.85
42.85x2=85.7