Answer:
A) 40 + d
B) 45 days
Step-by-step explanation:
A)
total cost = (cost of the air conditioner itself) + (money charged per day)*(days)
cost of air conditioner itself = $40
money charged per day = $1
days = d
40 + 1*d
= 40 + d
B)
total cost = 40 + d
total cost = $85
85 = 40 + d
45 = d
Time used the air conditioner for 45 days.
Answer:
the answer is D, acute angles
Step-by-step explanation:
all of the angles in the triangle are less than 90°
Answer:
Exact form: 9/10 , Decimal form: 0.9
Answer:
![r\geq -18](https://tex.z-dn.net/?f=r%5Cgeq%20-18)
Step-by-step explanation:
![\frac{-r}{3} \leq 6\\\rule{150}{0.5}\\(\frac{-r}{3})*3\leq 6*3\\\\-r \leq 18\\\\\frac{-r \leq 18}{-1}\\\\\boxed{ r\geq -18}](https://tex.z-dn.net/?f=%5Cfrac%7B-r%7D%7B3%7D%20%5Cleq%206%5C%5C%5Crule%7B150%7D%7B0.5%7D%5C%5C%28%5Cfrac%7B-r%7D%7B3%7D%29%2A3%5Cleq%206%2A3%5C%5C%5C%5C-r%20%5Cleq%2018%5C%5C%5C%5C%5Cfrac%7B-r%20%5Cleq%2018%7D%7B-1%7D%5C%5C%5C%5C%5Cboxed%7B%20r%5Cgeq%20-18%7D)
Hope this helps!