Answer:
7³= 343
Step-by-step explanation:
it indicates that the base is to be raised to a certain power
For this case what we should do is take into account the following vectors:

We must find the following subtraction of vectors:

Subtracting component to component we have:

By writing we have:

Then the module of the resulting vector is given by:

Rewriting we have:

Answer:
The module of the resulting vector is given by:

option B
The last one
solid particles bump into each other
Answer:
x = - 1
Step-by-step explanation:
The equation of the axis of symmetry for a parabola in standard form
y = ax² + bx + c : a ≠ 0 is found using
x = - 
y = - x² - 2x - 5 ← is in standard form
with a = - 1 and b = - 2, thus equation of axis of symmetry is
x = -
= - 1
Equation of axis of symmetry is x = - 1