HELP ILL GIVE BRAINLIEST!!! i need this rlly soon so im rlly desperate to give whoever answers this a brainliest and 5 stars and 15 points! ;-;

Answer:
a) -0.6
b) 8.1
c) -6.5
d) 5.2¯9. The little line on top of the 9 is "bar notation".
Step-by-step explanation:
Hope this helps =)