For real numbers a, b, and c, is ab=bc+3？ （1) ab=3b （2) b+3=c

For real numbers a and b, when is the equation ∣a+b∣=∣a–b∣true？

A.Always

B.Only when a=b

C.Only when a=0 and b=0

D.Only when a=0 or b=0

E.Never

The sum of the real numbers xand yis 11. Their dif-ference is 5. What is the value of xy？

A.3

B.5

C.8

D.24

E.55

For all real numbers p and r, p◇r= pr- p+r.

Column A Column B

(-4)◇5 5◇(-4)

A．if the quantity in Column A is greater

B．if the quantity in Column B is greater

C．if the two quantity are equal

D．if the relationship cannot be determined from the information given

It would be easier to memorize your PINs if you _________.

[A] produce them in a casual manner

[B] use numbers instead of letters

[C] relate them to the real world

[D] change them frequently

For all real numbers v, the operation v* is defined by the equation v* = v-(v/3). If (v*)*=8, then v=？

A．15

B．18

C．21

D．24

E．27

A．Fixed-point integer

B．Fixed-point decimal

C．Floating point numbers

D．ASCII

Why are three categories on the table missing numbers from last year？

A．Nobody invested in those areas last year.

B．People lost all their money in those investments.

C．Real estate was not divided into two categories last year.

D．The survey did not ask about real estate investments.

A.∣x+3∣=5

B.∣x-3∣=5

C.∣x+5∣=3

D.∣x-5∣=3

E.∣x+5∣=-3

A、f is a surjective homomorphism from V1 to V2

B、f is an injective homomorphism from V1 to V2

C、f is an isomorphism from V1 to V2

D、None of the above