Basic arithemtic concepts

A 1:

What is the value of ||3|-|-5||   ?

a)    -8

b)   -2

c)    0

d)   2

e)    8

A 2:

How many integers satisfy the inequality |x|< π ?

a)    0

b)   3

c)    4

d)   7

e)    More than 7

A 3:

If the product of 10 numbers is positive, what is the greatest number of them that could be negative ?

a)    0

b)   1

c)    5

d)   9

e)    10

Answer:1

=∣3-5∣=∣-2∣=2     (d)

Answer:2

|x|<π⇒-π<x<π⇒-3.14<x<3.14

There are 7 integers which satisfy this inequality : -3,-2,-1,0,1,2,3.

D choice is correct.

Answer:3

Since the product of 10 numbers is positive, all 10 of the numbers could be negative. So (e) is correct.