The cost of per square foot is 1200.
Step-by-step explanation:
Given,
Total area = 450 Square foot
Total cost = 540000
Cost of per square foot = 

The cost of per square foot is 1200.
Keywords: Area, Division
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Answer: -x^2 + 12x +5
Step-by-step explanation:
Even # --------- if it ends with 0, # of ways = 6*5*4 = 120 if not, 3 ways for ending digit, 5 ways for 1st digit, 5*4 for middle digits = 300
so total ways = 420
odd # --------- 4 ways of ending digit, 5 ways for 1st digit, 5*4 for middle digits = 400 ways
< 4000: ---------- 3 ways for starting digit, 6*5*4 ways for remaining digits = 360 ways
> 3000 & < 4000 ------------------------ 1 way for starting digit , 6*5*4 for remaining digits = 120 ways
Part a
60h ≤ 438
Part b
7.3 hours
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