r-12
substitute in r=7
so 7-12 = -5
Answer:

Step-by-step explanation:
we know that
To find out how much fabric Jen has left for the shorts, subtract the yards of fabric used in her new dress from the total yards of fabric Jen has.
so

Convert mixed number to an improper fraction

substitute

Convert to mixed number

8 . You round 31.9 to 32 then divide it by 4 which gives you 8
A1 = 0.91
a6 = -0.14
sum = (0.91+-0.14) /2
sum = 2.31
Answer:
The length of diagonal XU is 6.40 units
Step-by-step explanation:
* Lets explain how to find the distance between two points
- The rule of the distance between two points 
and
is:

* Lets solve the problem
-From the attached figure:
- The coordinates of the vertex X are (2 , 2)
- The coordinates of the vertex U are (-2 , 7)
∴ The point
= (2 , 2)
∴ The point
= (-2 , 7)
∴ 
∴ 
∵ 
∴ 
∵ 
∴ d = 6.40
* The length of diagonal XU is 6.40 units