Answer:
<em>D. 69 Km</em>
Step-by-step explanation:
<u>Scaling</u>
Maps usually represent real areas on the field, but since they cannot fit in pieces of paper, we use scales where sizes and distances are all proportional to the real measurements.
On the map of the question, we know 1 cm represents 30 Km. It means that we can know approximate real distances by measuring the distances on the paper or blueprints.
Two cities are 2.3 cm apart on the map, it means that they are really 2.3*30 =69 Km apart
Given:
The equation is:
To find:
The values of a, b and b from the standard form.
Solution:
The standard form of a quadratic equation is:
....(i)
We have,
In can be rewritten as
...(ii)
On comparing (i) and (ii), we get
Therefore, the correct option is C.
Step-by-step explanation:
use substitution method so it will now look like
8x + 5(-4x) = 24
8x + (-20x) = 24
-12x = 24 (divide both sides by 12)
-x = 2 (multiply both sides by negative 1)
x = -2
substitute to find y
y= -4(-2)
=8
45% of 54 = 24.3
54 - 24.3 = 29.7
So the new price is $29.7
Hope it helps!