Question

Can some one help me solve this please

Answer 1

First, you would need a common denominator so let's use 30. 
-42/30-(-25/30)
Subtraction means adding the opposite so this really means to add positive. (It's like a double negative is a positive)
-42/30+25/30
-17/30 is your final answer.

Answer 2

-7/5-(-5/6)
= -7/5+5/6
=( -42+25)/30
= - 17/30
hope it helped you