Answer:
Odd numbers.
Step-by-step explanation:
Closed under addition means you will able to take any two numbers from whatever set is mentioned and add them to get a number in that same set.
(If I say counting numbers, I'm still talking about the natural numbers.)
So let's look at the natural numbers {1,2,3,4,5,6,...}.
1+1=2
1+2=3
1+3=4
...
6+19=25
Let a and b be counting numbers.
a+b is still going to be a counting number.
You will always get a counting number when adding two counting numbers. So the counting numbers (also known as the natural numbers) is closed under addition.
Let's skip down to odd numbers because the other sets are similar to the first.
Let's add a pair of odd numbers.
3+5=8
8 is not odd so the odd numbers are not closed under addition because we will not always get an odd number. In fact, you will never get a odd number, but the thing is you just need one example to show it is not closed.
(2k+1)+(2a+1)
2(k+a)+2
2(k+a+1) is even so adding two odds will always give you an even.
Let's write this proportion of equivalent ratios in equation form and then plug in our two known values to determine our two unknown values:
(s1)2 : (s2)2 = A1 : A2
(10)2 : (7)2 = 100 : 49
Ratio of the Areas = 100 : 49
What is the problem exactly
Answer:
-3 plates
Step-by-step explanation:
Subtract 7 - 4 = 3. Since there are 7 FEWER plates then you add a negative sign in front of it.
Answer:
Step-by-step explanation:
Cos(Q) = adjacent to Q/Hypotenuse
adjacent = 15
Hypotenuse = 17.7
Cos(Q) = 15/17.7
Cos(Q) = 0.8475
The answer is C.
D is impossible. The cos of any angle can never be more than 1.
B is Tan(Q). They are not the same.
A is Sin(Q)
