If the regular price of an item is X dollars, what is the discount price in dollars?
2 answers:
Answer:
First, we have to know the discount percentage.
Let's say that is 20% off, this would be in decimal number 0.20.
Now, if the regular price is , then the dollars discounted are
And the final price is
Which means that the final price is 80% of the regular prices.
Now, for a general case, let's call the percentage discount, in this case, the final price would be
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Given:
A figure of an isosceles trapezoid with bases 18 and 24, and the vertical height is 4.
To find:
The legs of the isosceles trapezoid.
Solution:
Draw another perpendicular and name the vertices as shown in the below figure.
From the figure it is clear that the AEFD is a rectangle. So,
Since ABCD is an isosceles trapezoid, therefore in triangle ABE and DCF,
(Legs of isosceles trapezoid)
(Vertical height of isosceles trapezoid)
(Right angle)
(HL postulate)
(CPCTC)
Now,
Using Pythagoras theorem in triangle ABE, we get
Taking square root on both sides, we get
Side length cannot be negative. So, .
Therefore, the length of legs in the given isosceles trapezoid is 5 units.
