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X = 25 dollar items and y = 15 dollar items
x + y = 72....x = 72 - y
25x + 15y = 1380
25(72 - y) + 15y = 1380
1800 - 25y + 15y = 1380
-25y + 15y = 1380 - 1800
-10y = - 420
y = -420/-10
y = 42
x + y = 72
x + 42 = 72
x = 72 - 42
x = 30
so they sold 30 twenty five dollar items (x) and 42 fifteen dollar items (y)
Answer:
X would equal 4
Step-by-step explanation:
5 x 4 is 20. And the equation was 5x + 1 = 21.
So, the answer would equal 20. Hope this helped!! :D
Answer:
The exact value of cotФ is
Step-by-step explanation:
Given as:
The value of cosec Ф =
Let the value of cotФ = x
Now, According to question
∵ sinФ = .....1
Put the value of cosec Ф = in eq 1
i.e sinФ =
Or, sinФ =
<u>Again</u>
∵ cosФ =
So, cosФ =
Or, cosФ =
Or, cosФ =
∴ cosФ =
<u>Again</u>
we know that cotФ =
So, cotФ =
Or, cotФ =
As according to question sinФ lies in third quadrant
So, cotФ =
Hence, The exact value of cotФ is . Answer