2nd prep

If 2𝑥 + 1 = 7 then 3𝑥=⋯

• 6

• 9

• 12

• -12

• 2

• 3

• 4

• 8

] −1 , 3 ] ∪ { 0 , −1 }=⋯

• ] 0 , 3 ]

• ] −1 , 3 [

• [ −1 , 3 ]

• [ 0 , 3 ]

• 5

• 4

• 1

• 3

[ −1 , 5 ] − ] −1 , 5 [ = ⋯

• ∅

• { −1 , 5 }

• [ −1 , 5 ]

• ] −1 , 5 [

The irrational number between 3 and 4 is

• 3.6

The S . S. of the equation 𝑥 + 5 = 5 in 𝑁 is

• ∅

• {0}

• {10}

• {−10}

• 𝑥

The degree of 2𝑥³𝑦² is

• Second

• third

• fourth

• fifth