The chart shows the bids provided by four contractors to complete a job. Which contractor is the most cost-effective? Joshua Carmen Dante Alicia

Chart for question attached

Joshua

Explanation:

By cost-effective here, we mean the contractor that does the job best at the shortest time and lowest money cost. To get this, we calculate total cost for each contractor and then consider time for completion of the job:

Joshua charges $25 per hour for 5 hrs

Carmen charges $20 per hour for 7 hrs

Dante charges $30 per hour for 6 hrs

Alicia charges $20 per hour for 8 hrs

Joshua's cost= $25×5=$125 in 5 hours

Carmen's cost = $20×7= $140 in 7 hours

Dante's cost= $30×6=$180 in 6 hours

Alicia's cost= $20×8= $160 in 8 hours

From the above we can see that Joshua is the most cost-effective contractor given that he completes the job in less time and with less money.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.