Answer: Last option.
Step-by-step explanation:
For this exercise you need to find the Discriminant.
The formula used to find the Discriminant, is the following:

In this case, given the Quadratic equation:

You can identify that:

Knowing those values, you must substitute them into the formula and then you must evaluate in order to find the Discriminant.
You get that this is:

By definition, if:
Then the Quadraitc equation has 2 nonreal solutions.
Answer:
5.4864
Step-by-step explanation:
to the nearest tenth probably 0.5
First:
F=m.a
=4*7
=28N
Second:
F=m.a
28=m.2. (force is constant,so F=28N)
28/2=m
m=14kg.
Answer:
3
Step-by-step explanation:
10 or 25 and a lot more pretty much anything that ends with 0 or 5