The answer is Integers just took the test
Step-by-step explanation:
To Find : Which of the following sets is closed under subtraction?
A.) integers,
B.) whole numbers,
C.) natural numbers,
D.) irrational numbers
Solution :
A set of elements is closed under an operation if, when you apply the operation to elements of the set, you always get another element of the set.
Natural numbers are only closed under addition and multiplication
Irrational Numbers: This set is closed for none of the operations
Integers: This set is closed only under addition, subtraction, and multiplication.
Whole Numbers: This set is closed only under addition and multiplication.
Option A integers
If we subtract any two integers we will get an integer
eg : -6-8= -14
Thus option A is closed under subtraction
$7 + $0.20p = $5 + $0.30p
Step-by-step explanation:
UPS charges $7 for the first pound and $0.20 for each additional pound.
FedEx charges $5 for the first pound and $0.30 for each additional pound.
Let's take the number of additional pounds that will make UPS and FedEx cost the same to be p.
$7 + $0.20p = $5 + $0.30p
$7 - $5 = $0.30p - $0.20p
$2 = $0.10p
p = = 20 additional pounds