Question

State whether the following statements are true or false :
(a) Integers are closed under addition [ ].
(b) Integers are not closed under subtraction [ ].
(c) Whole numbers are closed under subtraction [ ].
(d) Integers are not closed for commutative property under addition [ ].
(e) Integers are closed for commutative property under addition [ ].
(f) Integers are not closed for associative property under addition [ ].
(g) Integers are not closed for commutative property under subtraction [ ].
(h) For three integers a, b, c, a + (b + c) ≠ (a + b) + c [ ].
(i) a - b = b - a [ ].
(j) a + b = b + a [ ].
please help someone my exam is yesterday.
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Answer 1

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10 examples of friction in our daily life

Driving of a a vehicle on a surface.

Applying brakes to stop a moving vehicle.

Skating.

Walking on the road.

Writing on notebook/ blackboard.

Flying of aeroplanes.

Drilling a nail into wall.

Sliding on a garden slide.

Answer 2

Answer:

Movement in demand curve, occurs along the curve, whereas, the shift in demand curve changes its position due to the change in the original demand relationship. Movement along a demand curve takes place when the changes in quantity demanded are associated with the changes in the price of the commodity.