Special right triangles. A special right triangle is a right triangle with some regular feature that makes calculations on the triangle easier, or for which simple formulas exist. For example, a right triangle may have angles that form a simple ratio, such as 45-45-90. This is called an "angle based" right triangle.
There are 11 elements are in (A U B)
<h3>How to determine the number of elements?</h3>
The given parameters are:
n(A) = 4
n(B) = 7
The number of elements in (A U B) is calculated using:
n(A U B) = n(A) +n(B) - n(A U B)
Given that the sets have distincts elements, we have:
n(A U B) = 4 + 7 - 0
Evaluate
n(A U B) = 11
Hence, there are 11 elements are in (A U B)
Read more about sets at:
brainly.com/question/2166579
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Answer: oringial sale price = $40
Step-by-step explanation:
Find 25% of the sale price and add it to the sale price to find the original price
So - 10% - is 3.2
20% - is 3.2 x 2 =6.4
5% - is 3.2 divided by 2 = 1.6
25% - 6.4 + 1.6 = 8
Original sale price - $8 + $32 = $40
