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.

To add -57 and -22, you can simply add the two numbers together: -57 + (-22) = -79.

To place the numbers 25, -13, 8, -2, 13, 3, and 18 in ascending order, you can compare the numbers and rearrange them from smallest to largest. The ascending order of these numbers is: -13, -2, 3, 8, 13, 18, 25.

To perform the indicated operation -21 - (-9) / -21 - (-21), first solve the operation inside the parentheses: -21 - (-9) = -21 + 9 = -12. Then solve the operation outside the parentheses: -21 - (-21) = -21 + 21 = 0. Finally, divide -12 by -42 to get the result: -12 / -42 = 1/3.

To add -3/5 and 8/35, you need a common denominator. The least common multiple of 5 and 35 is 35. Convert both fractions so that they have a denominator of 35: -3/5 = -21/35 and 8/35 stays the same. Now, add the fractions: -21/35 + 8/35 = -13/35.

To subtract -2.3 and -8.8, you can simply subtract the two numbers: -2.3 - (-8.8) = -2.3 + 8.8 = 6.5.