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g100num [7]
4 years ago
5

How many combinations of three books can be selected from 40 books?

Mathematics
1 answer:
earnstyle [38]4 years ago
8 0

Answer:

13

Step-by-step explanation:

You just count by adding 3 every time

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You can upgrade lighting at your factory to LED bulbs that cost $6.95 each and last an average of 5 years. It costs S3 in labor
marshall27 [118]

Answer:

11.95 dollars

Step-by-step explanation:

Cost of one LED bulb = 6.95 dollars

Cost of changing one bulb = 3 dollars

Life of each bulb = 5 years.

In 10 years, only one time after 5 years the bulbs would have been changed

Hence cost of 100 lamps = 695 and

cost of changing once = 500

Total cost = 1195 dollars for 11 years

Divide this by 10 years to get average cost per year

Cost of 100 lamps per year = 1195/100 = 11.95 dollars


8 0
3 years ago
Help!!! ASAP!!!!!!!!
Svet_ta [14]

Answer:

-18y = 1

y = -1/18

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4 years ago
At one of my first jobs, I made $5 per hour. Make a prediction about how much I would have made if I worked for 32 hours in week
enot [183]
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5 0
3 years ago
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Can someone please explain this question
EleoNora [17]
Sure thing!

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Just solve this for a and you’ll have your answer :)
5 0
2 years ago
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Charlie runs at a speed of 3 yards per second.about how many miles does Charlie run
crimeas [40]
I think since he runs 3 yards per hour per second their are 60 seconds in a minute so 60 times  equals 180 yards per second
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