Answer:
mary=10 jack=15
Step-by-step explanation:
After 4 years Mary (x+4), Jack's age (x+5) + 4.
sum of the ages after 4 years :(x+4) + (x+5) +4=33 
Simplifying the equation:
 2x+13 = 33 ----->> 2x=20----->>>>x = 10 Mary's age
 10 + 5 = 15 which is Jack's age. 
 
        
             
        
        
        
Answer:
The ordered pair to represent a in the equation a=2b+c if b=(6,3) and c=(-4,8) is: a=(8,14)
Step-by-step explanation:
b=(6,3)
c=(-4,8)
a=2b+c
Replacing b and c in the equation above:
a=2(6,3)+(-4,8)
Multiplying:
a=(2*6,2*3)+(-4,8)
a=(12,6)+(-4,8)
Adding:
a=(12+(-4),6+8)
a=(12-4,14)
a=(8,14)
 
        
             
        
        
        
Answer:
7/10
Step-by-step explanation:
(2/5)%(-4/7)
We will change the second fraction to make multiplication
So it will be 2/5×-7/4
=. -14/20
= -7/10
 
        
             
        
        
        
Answer:
15/2
Step-by-step explanation:
My interpretation of your math expression is "2  1/2 divided by 1/3."
I prefer to write this as:
  5        1
----- ÷ -----
  2         3
which is equivalent to:
  5        3
----- * ----- = 15/2
  2        1
 
        
             
        
        
        
Answer:
Step-by-step explanation:
Each child received two pieces.
So total   pieces received by 4 children = 4*2 = 8
Total pieces = 10 + 8 = 18