Well since two solid numbers cant make 7 I would do 3.5 x 7
Scientific notation is a way to write compactly numbers with lots of digits, either because they're very large (like 2393490000000000000000000), or very small (like 0.0000000000356).
We use powers of ten to describe all those leading/trailing zeros, so that we con concentrate on the significat digits alone.
In your case, the "important" part of the number is composed by the digits 6 and 1, all the other digits are zero. But how many zeroes? Well, let's do the computation.
Every power of 10,
is written as one zero followed by n zeroes, so we have

Multiplying a number by
means to shift the decimal point to the right and/or add trailing zeroes n times. So, we have to repeat this process six times. We shift the decimal point to the right one position, and then add the five remaning zeroes. The result is thus

We are given with the following vertices:
A (0,0)
B (-1,1)
C(6,1)
D (2.0)
Next is to plot the vertices in the Cartesian plane so that we can identify the figure. See attached image.
The identified shape is a "Parallelogram".