Question

Subtract -7.1 - (8.3)= -1.2 ?
multiply (7.6)(1)(-6)=7.6 ?
divide 90/18=5 ?
find the reciprocal of 1/3(9-4)=3/5?
subtract 7/9-(13/18=-1/18?

Answer 1

"Subtract -7.1 - (8.3)= -1.2 ?"
Incorrect.
Draw the number line:
-7.1 is 7.1 to the left of 0.
-8.3 is 8.3 to the left of -7.1.
So -7.1-8.3 is 15.4 to the left of 0, which makes -15.4.

"multiply (7.6)(1)(-6)=7.6 ?"
Incorrect.
In a multiplication, if the number of negative numbers is odd, the result is negative.

"divide 90/18=5 ?"
correct

"find the reciprocal of 1/3(9-4)=3/5?"
If what you mean is (1/3)(9-4), 3/5 is correct.

"subtract 7/9-(13/18=-1/18? "
Incorrect.
7/9-13/18
=14/18 - 13/18
=1/18

Answer 2

Thank you for assisting me :)

Answer 3

You're welcome!

I hope you understood how you could get the right answer!