Assume that the other number is y.
we know that the addition of both number is -9
this means that:
x+y=-9
reorder this equation to seperate the y variable:
y=-9-x
20.5 is the answer, have a great day!

P. S. The inequality sign changed or flipped when there's a negative figure involved.
Hope this helps. - M
Answer:
a
Step-by-step explanation:
Answer:
$140
Step-by-step explanation:
if 30% of full price = $42 then 100% = 42/0.3 = 140