Answer:
k = -10
Step-by-step explanation:
-9 + k/10 = -10
-10/10 = -1
-9 + -1 = -10
Top/Bottom = 12
Sides = 15
Front/Back = 20
20 + 15 + 12 = 47
47 / 1/2 = 23.5
trinomial
260000
Estimate = <u>300000</u>