RyanRyan Street Barber Shop pays $ 30$30 per month for water for the first 12 comma 00012,000 gallons and $ 2.50$2.50 per thousand gallons above 12 comma 00012,000 gallons. Calculate the total water cost when the barber shop uses 8 comma 0008,000 gallons, 13 comma 00013,000 gallons, and 17 comma 00017,000 gallons.

Explanation:

8,000

This amount is below the quantity for which additional charges accrue. The base charge applies: $30.

13,000

This is 1000 gallons more than you get for $30, so costs an additional $2.50. The total water cost is ...

  $30 +2.50 = $32.50

17,000

This is 5,000 gallons more than you get for $30, so costs an additional 5×$2.50 = $12.50. The total water cost is ...

  $30 +12.50 = $42.50

Comment on the water charges

$30 is the same as the cost of 12,000 gallons at $2.50 per thousand. So, the total bill can be figured at $2.50 per thousand, with a $30 minimum.

  8 × $2.50 = $20, so the charge is the minimum, $30

  13 × $2.50 = $32.50

  17 × $2.50 = $42.50

ans.

heterothermic organisms include those organisms that can switch between homeothermic (having body temperature higher than environment) and poikilothermic (having variation in internal body temperature) strategies.

some migratory birds show heterothermy as they decrease their metabolic rate during cold nights to keep their body temperature low. drop in metabolic rate allows increase in production efficiency of birds that reduces the internal body temperature to make it equal to external cold temperature during cold nights.

thus, the correct answer is 'birds allow their temperature drop in order to increase their production efficiency.'

a. money supply  

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