The correct answer to your question is number 2
        
             
        
        
        
Step-by-step explanation:
let necklace : x
let earrings : y
x+y=144 -1st eqn
6x+5y=825 -2nd eqn
y=144-X -3rd eqn
substitute eqn into 2nd eqn
6x+5(144-x)= 825
6x +720-5X =825 (expanded)
X = 825-720
X =105 
substitute "X=105" into 1st eqn
(105)+y=144
y= 144-105
y=39 
1 necklace = 105$
1 pair of earrings = 39$
(to check back: substitute the value into the original eqn)
 
        
             
        
        
        
Answer:
   30 years
Step-by-step explanation:
2 is a factor of 30, so the LCM of 2 and 30 is 30.
Saturn and Mars will appear in the same direction in the night sky every 30 years.
 
        
             
        
        
        
Answer:
cost = 8p + 5
Step-by-step explanation:
$8*[number of pizzas] + $5 delivery fee
$8p + $5
8p + 5
cost = 8p + 5