It is not! There is not an efficient form of multiplication to add 3 to 7.
7*(13/7) = 10 can hardly be described as a more efficient operation!
Parenthesis Exponent Multiplication Division Addition Subtraction PEMDAS ( the multiplication and division is based on which of them comes FIRST )
The set of integers is closed with respect to multiplication and with respect to addition.
Addition and multiplication are operations on integers that are commutative.
Addition, subtraction and multiplication.
The answer depends on which binary operation you mean when you say "combining". Addition, subtraction, multiplication, division, exponentiation, etc.
Yes.
Yes.
Multiplication is the same as repeated addition. For example 12 * 3 = 12 + 12 + 12 12 * 4 = 12 + 12 + 12 + 12 and so on.
Closure with respect to addition and multiplication. Cummutative, Associative properties of addition and of multiplication. Distributive property of multiplication over addition.
add subtract divide multiplication
Yes it is : a + b = b + a for all integers a and b. In fact , if an operation is called addition you can bet that it is commutative. It would be perverse to call an non-commutative operation addition.
You don't say that "an integer is closed". It is the SET of integers which is closed UNDER A SPECIFIC OPERATION. For example, the SET of integers is closed under the operations of addition and multiplication. That means that an addition of two members of the set (two integers in this case) will again give you a member of the set (an integer in this case).