Given:
The equation of a quadratic function is:

To find:
The equation of the axis of symmetry for the given function.
Solution:
If a quadratic function is
, then the equation of the axis of symmetry is:
...(i)
We have,

Here,
. So, the equation of axis of symmetry by using (i), is
Therefore, the correct option is C.
Speed of Sam = Distance / Time
Here, Distance = 1 Km
Time = 1/3 hour
Substitute the values, in the formula:
Speed = 1 / 1/3 = 3 Km/h
Now, In next situation, Speed = 3 Km/h
& Time = 4/5 hour.
Substitute the values, in the same formula:
Distance = Speed × Time
D = 3 * 4/5
D = 12/5 = 2.4 Km
In short, Final answer of your question would be 2.4 Km
Hope this helps!

Solution:
Given expression:

<u>Expansion of PEDMAS:
</u>
Parenthesis, Exponents, Division, Multiplication, Addition, Subtraction.
To solve the given expression using pedmas rule.
First solve the expression with parenthesis.

Next do the exponents.

Finally do the addition.

Hence the answer is 80.