3rd prep quiz 1

If : (5,𝒙−8)=(𝒚+1,-5) , then : 𝒙+𝒚=......

• 4

• 7

• 5

• 6

𝒙×∅=......

• ∅

• 0

• 1

• 2

{3}x{3}=......

• {3}

• (3,3)

• {3,3}

• {(3,3)}

If :n(X)=4 , Y={3,4} , then n(X×Y)=......

• 6

• 10

• 9

• 8

If : X={1,2} and Y={3,4} , then: (3,2)∈......

• X . Y

• X²

• Y . X

• Y×Y

• 2

• 3

• 9

• 81

• 1

• 49

• 14

• 7

if the point (x,7) lies on the y-axis , then 5x+1 = ........

• zero

• 1

• 5

• 6

• first

• second

• third

• fourth

In which quadrant is the following point?
(-3, 12)

• first

• second

• third

• fourth