carlosluiscontrerasp
12.10.2019 •
Mathematics
Robert studied 1 2/5 hour every day for 7 days. how many hours did roberto study in 7 days?
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Ответ:
1 2/5 = 7/5
7/5 * 7 = 49/5 = 9 4/5 hours
Ответ:
a = 2
Step-by-step explanation:
substitute x with the number 5.
5+8a=25+5a-7a
subtract 5a from both sides
5+3a=25-7a
add 7a to both sides
5+10a = 25
subtract 5 from both sides
10a=20
divide both sides by 10
a = 2