Natural numbers are closed under division: false.
A set is closed under a certain operation if the results of that operation are always inside that set.
So, if natural numbers were closed under division, the division of two natural numbers would always be a natural number.
You have plenty of counterexamples, to pick one you may divide any odd number by 2: 5/2 is not a natural number.
Negative numbers are closed under addition: true.
Let 
be two positive numbers. So, 
are two negative numbers. Their sum is
And since 
is positive, we deduce that 
is negative, so the sum of two negative numbers is still negative.
Prime numbers are closed under subtraction: false.
This would mean that the subtraction of two primes is also a prime. Again, there are many counterexamples: 7 is prime and so is 3, but their difference 7-3 is 4, which is not prime.
Answer:
D. 95 + 47 + 5.12 12 ÷ 4 ≠ 4 ÷ 12.
Step-by-step explanation:
(70 +30) + 72 B. 21 + (-14) + (-53) O C. 67 +1 - 18. So 12÷4≠4÷1/4 + 3/4 + 2. C. 20 + 80 + (-11)
Answer:
33.83
Step-by-step explanation:
This is because if you trying to find h and the opposite side, you will have to use cos to get that answer. My using this equation
You will find that x will equal 33.83
Hope this Helped
Answer:
ab • (11a + b + 1) If its not im really sorry
Step-by-step explanation:
STEP one
(((((3•(a2))•b)+5ab)-4ab)+(a•(b2)))+(23a2•b)
STEP Two
((((3a2 • b) + 5ab) - 4ab) + ab2) + 23a2b
STEP 3
STEP 4
Pulling out like terms
4.1 Pull out like factors :
11a2b + ab2 + ab = ab • (11a + b + 1)
