Answer:
-9 < r < -7
Step-by-step explanation:
9 + 3r < 2 + 2r
r < -7
-3 - 5r < 6 - 4r
-9 < r
r > -9
-9 < r < -7
Answer:
D
Step-by-step explanation:
-2x(x+3)
-2x-6
1 and 1/3 is 3/3 and 1/3 so is 4/3 then
4/3 -5/6 they have to have the same denominators so multiply the first fraction with 2/2
(4•2/3•2)-5/6=(8/6)-(5/6)= (8-5)/6=3/6 that you can simplify as 1/2
A, B and D are already rational numbers, 0.4 itself is a rational number, two rational numbers make a product of rational number.
So A, B, D are the correct choices.
Are you sure it asks for rational numbers, not irrational number?
Answer: yes, it is
Step-by-step explanation:
A number is divisible by 6 if it is divisible by 2 and 3 simultaniously.
n = k(k+1)(k-1)
If k-1 is a multiple of 3, n is divisible by 3, so one of the requirements is ok.
Now, if k-1 is a multiple of 3, it can be even or odd.
if k-1 is even, then it is divisible by 2 and as it is divisible by 3 as well, n is divisible by 6
if k-1 is odd, then k and k+1 is even, hence, divisible by 2.
As n = k(k+1)(k-1), n is also divisible by 6.