5x=39 x stands for the age of bob so 39/5 =7.8 which is rounded up to 8 and if you multiply 8 by 5 you get 40 but if you multiply 7.8 by 5 you get 39 so his age would be 7.8 years old.
the answer would (d) graph D
4.50 ÷ 5 = 0.9
The unit price is $0.9 or ¢9.
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