Answer:
(17 + 4)/4
Step-by-step explanation:
"of the sum of 17 and 4" = 17 + 4
"1/4 of"... = 1/4
Put the two expressions together:
1/4 * (17 + 4)
(17 + 4)/4 is your answer.
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b
Answer: gravity affect only the mass
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