math115
posted by p .
add 57+(22)=79
place numbers in acsending order 25,13,8,2,13,3,18=13,2,3,8,13,18,25
perform the indicated operation 21(9)/21(21)=12/42
add 3/5+(8/35)=13/35
subtract 2.3(8.8)=6.5

perform the indicated operation 21(9)/21(21)=12/42
You may have parentheses missing.
You need to ADD parentheses around a denominator and a numerator of a fraction.
add 3/5+(8/35)=13/35
3/5 = 21/35, so it cannot be positive when added to 8/35. 
29/35?

ow so the answer would be negative 13/35?

13/35 is correct.