Yes. Because the x and the 5 can change in same ways.
Yes. Because the x and the 5 can change in same ways.
Yes they do.
the order of the factors does not alter the result
yes
If x stays the same the expression stays the same. Since the expression involves negative x, the value of the expression decreases as x increases.
The given expression is the same as 15+x+y simplified
Yes, -6+x is the same as x-6.
20
It is the same as 54 plus 36 and both expressions add to 90
++ is an operator that increments the operand. The value of the operand in the expression is incremented first if the ++ is before the operand. The value of the operand in the expression is the same value if the ++ is after the operand.
5+8 is the same as 10+3 = 13
When adding, the order does not matter. It's called the summation property.