Asked by goodog

True or False:
Bacteria, viruses, fungi, and protozoans can all cause different diseases.
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about 80 percent of infectious disease is spread by hand contact; true or false.
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the best way to avoid food poisoning is to:
A. Follow food safety rules.
B. Only wash surfaces After preparing food.
C. Cook everything.
D. Only eat fruit and vegetables.
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Solve:
6C3
A. 120
B. 720
C. 20
D. 240
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which is not a combination:
A. Choosing three toppings for your pizza.
B. Lining three students up in a row.
C. Choosing three desserts from a tray of ten.
D. Choosing 5 students to represent a class of 30.
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how many ways can you choose 3 dishes from a menu of 8.
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is choosing 5 players to represent the whole team a permutation or a combination
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solve 6P4
A. 240
B. 720
C. 20
D. 360
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how many different ways could you arrange 4 books on a shelf
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is choosing 2 topping from a list of eight a permutation or a combination
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how many different ways can you choose 3 topping out of a list of 20
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Pure water and pure salt are poor conductors of electricity. When salt is dissolved in water, the resulting solution conducts electricity well. Which statement explains why this occurs with these substances?(1 point)
Responses

The process of dissolving more closely binds the electrons in the solution.
The process of dissolving more closely binds the electrons in the solution.

The process of dissolving frees the electrons in the solution to move.
The process of dissolving frees the electrons in the solution to move.

The process of dissolving frees the atoms in the solution to move.
The process of dissolving frees the atoms in the solution to move.

The process of dissolving closely binds the ions in the solution.
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Which statement correctly describes the conductivity of the specified material?(1 point)
Responses

Gold has high conductivity.
Gold has high conductivity.

Plastics have high conductivity.
Plastics have high conductivity.

Copper has low conductivity.
Copper has low conductivity.

Aluminum has a low conductivity.
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A person plugs a power cord into an electrical outlet in the wall. The power cord is covered in black rubber. Which statement is an accurate description of the materials?(1 point)
Responses

Electrons would not move through the wire if there was no rubber around the wire.
Electrons would not move through the wire if there was no rubber around the wire.

Electrons easily move through the rubber around the wire.
Electrons easily move through the rubber around the wire.

Electrons move through air when the cord is a few inches from the outlet.
Electrons move through air when the cord is a few inches from the outlet.

Electrons would easily move through the person if there was no rubber around the wire.
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Which statement describes a similarity between conductors and insulators?(1 point)
Responses

They both allow for the free flow of electrons between atoms.
They both allow for the free flow of electrons between atoms.

They both involve high resistance to electrical charge.
They both involve high resistance to electrical charge.

They can both be used in an electric circuit.
They can both be used in an electric circuit.

They can both be made without matter.
They can both be made without matter.
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True
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True.
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A. Follow food safety rules.
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A. 120

Explanation:

6C3 = (6!)/(3!*(6-3)!)

= (6*5*4)/(3*2*1)

= 120
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B. Lining three students up in a row.
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The number of ways to choose 3 dishes from a menu of 8 can be calculated using the combination formula:

n C r = n! / (r! * (n-r)!)

Here, n = 8 and r = 3:

8 C 3 = 8! / (3! * (8-3)!)

= (8 * 7 * 6) / (3 * 2 * 1)

= 56

Therefore, there are 56 ways to choose 3 dishes from a menu of 8.
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Choosing 5 players to represent the whole team is a combination, because the order of the players does not matter.
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D. 360

Explanation:

6P4 = 6! / (6-4)!

= 6! / 2!

= (6 * 5 * 4 * 3 * 2 * 1) / (2 * 1)

= 360
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The number of different ways 4 books can be arranged on a shelf can be calculated using the permutation formula:

n P r = n! / (n-r)!

Here, n = 4 and r = 4:

4 P 4 = 4! / (4-4)!

= 4!

= 4 x 3 x 2 x 1

= 24

Therefore, there are 24 different ways to arrange 4 books on a shelf.
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Choosing 2 toppings from a list of 8 is a combination, because the order in which the toppings are chosen does not matter.
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The number of ways to choose 3 toppings out of a list of 20 can be calculated using the combination formula:

n C r = n! / (r! * (n-r)!)

Here, n = 20 and r = 3:

20 C 3 = 20! / (3! * (20-3)!)

= (20 * 19 * 18) / (3 * 2 * 1)

= 1140

Therefore, there are 1140 different ways to choose 3 toppings out of a list of 20.
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The process of dissolving frees the ions in the solution to move.
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Gold has high conductivity.
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Electrons easily move through the rubber around the wire.
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They can both be used in an electric circuit.