Answer:
-40%
Step-by-step explanation:
10 is the old value and 6 is the new value. In this case we have a negative change (decrease) of -40 percent because the new value is smaller than the old value.
It would be 40% decrease
b
-y + 9 = 23
-y = 23 - 9
-y = 14
-1 x (-y) = -1 x 14
y = -14
ANSWER: C