<span>
D. 15:1
is equivalent to 30:2. (:</span>
When you multiply the two binomials you get a quadratic function with a negative lead coefficient.
This function will fall on the left and fall on the right.
If the lead coefficient were positive the function would rise in both the left and the right.
If you are working out the diagonal line you need to use Pythagoras Theroum: c² = a²+b²
c² = 7²+12² = 193
√c² = c = √193 = 13.89
The length of the diagonal side is 13.89,
Hope this helps! :)
We can't tell from the information you've given.
With the dots at the end, you showed that there's more
to the decimal. But you didn't say how much more.
-- If the decimal EVER ends, even after a billion places,
then it's rational.
-- If it repeats, then it's rational. That .80012569923 may repeat,
or part of it, like the 9923, may repeat, or the whole thing may be
part of some larger bunch that repeats. We don't know.
4 1/2 + 2 4/5
4 + 2 = 6
1/2 + 4/5 = 5/10 + 8/10 = 13/10 = 1 3/10
6 + 1 3/10 =
7 3/10 <===