That's going to depend completely on the unit of
the 4.5 which, sadly, you have not mentioned.
Answer:
The second and fourth option
Step-by-step explanation:
In order for two lines to be perpendicular they must intercept each other and their slope must be the opposite inverse; ex:
the negative inverse is 4 (multiplying by -1 and flipping the fraction)
Question 1:
We have to find the LCD of
and 
LCD is the least common denominator is the lowest common multiple of the denominators of a set of fractions.
Here the denominators are 5 and 6.
So, we will find the LCM of 5 and 6
5 = 
6 = 
LCM of 5 and 6 = 
= 30
Therefore, the LCD of these numbers is 30.
Question 2:
We have to find the difference between
and
.
Difference = 
LCM of 7 and 14 is 14
Therefore, difference = 
= 
Question 3:
Amount of brown sugar used by Sandy = 
Amount of sugar increased by Sandy = 
Total amount of Sugar used by Sandy = 
LCM of 3 and 9 is 9.
Total amount of Sugar used = 
=
cup
Question 4:
Let the number which should be added to
to make the sum greater than
be 'x'
So, 

LCM of 2 and 15 is 30.


So, the number is 
Question 5:
We have to identify the set of mixed numbers has a difference less than 1.
Set 1:
and 
Difference = 
= 
= 
This set has difference less than 1.
Set 2:
and 
Difference = 
= 
= 
This set does'not have difference less than 1.
Set 3:
and 
Difference = 
= 
= 
= 
This set does'not have difference less than 1.
Set 4:
and 
Difference = 
= 
= 
This set does'not have difference less than 1.