Answer: -30
-18 -27 -(-15)
-18 -27 +15
-45 +15
-30
Step-by-step explanation:
Answer: -7+3y
Step-by-step explanation:
6x-8x-5x+3y
6x-5x= x
x-8x=-7x
-7x+3y
Answer:
31 scientific calculators
54 graphing calculators
Step-by-step explanation:
X = number of $15 calculators
Y = number of $67 calculators
X+Y = 85 then X = 85-Y
15X+67Y = 4083
substitute for X
15(85-Y)+67Y = 4083
1275 - 15Y + 67Y = 4083
reduce
52Y = 2808
Y = 54
X = 31