Answer:
The mashi e drilled down 45 feet. So -45
Step-by-step explanation:
72 = 24h
X = 15h
24x = 1080
x = 45
18.9
21+(-3)-(-0.9) = 21-3+0.9 = 18+0.9 = 18.9
12^2=144
144 is divided by b which also is an odd interger, there only 2 numbers : 1 and 3
if b=3, a^2=48, then there will be no a available
if b=1 , a^2=144, then a is 12 and 12 can not be divided by 9
The answer is D
