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Elina [12.6K]
3 years ago
9

Find the Cartesian equation of the curve with parametric equations x = 2 sec(t) and y = 3 tan(t) for t ∈ π/2 , 3π/2, and describ

e the curve.
Mathematics
1 answer:
Nikolay [14]3 years ago
6 0

Answer:

4y^2 - 9x^2 = -36

Step-by-step explanation:

x = 2 sec t

y = 3 tan t

x^2 = 4 sec^2 t

y^2 = 9 tan^2 t

Now sec^2t = 1 + tan^2 t so we have:

4(1 + tan^2 t) + 9 tan^2 t = x^2 + y^2

4 + 13 tan^2 t = x^2 + y^2

13 tan^2 t = x^2 + y^2/ - 4

tan^2 t = x^2/13 + y^2/13 - 4/13

But , from the second equation tan t =  y/3 so tan^2 t = y^2/9, so:

y^2/9 =  x^2/13 + y^2/13 - 4/13

LCM of 9 and 13 is 117 so multiply thru by 117:

13y^2 = 9y^2 + 9x^2- 36

4y^2 - 9x^2 = -36

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A firm offers routine physical examinations as part of a health service program for its employees. The exams showed that 8% of t
oee [108]

Answer:

The Probability = 0.20

Step-by-step explanation:

From the question stated, the first step to take is to find probability that an employee selected at random will need either eyeglasses or major dental work

Solution

Given

Now,

The exams showed tha the number of employees needed eyeglasses = 8%

Employees that needed major dental work = 15%

Employees that needed  both eyeglasses and major dental work =3%

Thus,

The P(needed eyeglasses ) = 8% = 0.08

P(major dental work) = 15% = 0.15

P(eye glasses  and major dental work) = 3% = 0.03

The probability that an employee selected at random will need either eyeglasses or major dental work is  given as

= P(eye glasses ) + P(major dental work) - P(eyeglasses and major dental work)

= 0.08 + 0.15 - 0.03 = 0.20

Therefore the Probability = 0.20

5 0
3 years ago
How many terms are in the sequence: 1100, 1135, 1170,.......,3725?
Gennadij [26K]

well, the sequence goes, 1100, to 1135, to 1170.... notice, is simply adding 35 to get the next term, so the common difference is 35, and the first term is 1100 of course.


\bf n^{th}\textit{ term of an arithmetic sequence}
\\\\
a_n=a_1+(n-1)d\qquad
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
d=\textit{common difference}\\[-0.5em]
\hrulefill\\
a_1=1100\\
d=35\\
a_n=3725
\end{cases}
\\\\\\
3725=1100+(n-1)35\implies 3725=1100+35n-35
\\\\\\
3725=1065+35n\implies 2660=35n\implies \cfrac{2660}{35}=n\implies 76=n

6 0
3 years ago
Really confused on how to approach this problem.​
kkurt [141]

Step-by-step explanation:

For this Q, you should draw a triangle to help you with the values.

cos x =

\frac{ \sqrt{2} }{2}

csc x =

\frac{2}{ \sqrt{2} }

tan x = sin x/ cos x

= 1

cot x = 1

sec x =

\frac{ \sqrt{2} }{2}

x = 45 degrees

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3 years ago
Convert the angle theta=7/4pi radians to degrees
bagirrra123 [75]
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3 years ago
Express the following relationship as a rate.
klasskru [66]

Answer:

3 pages per minute

Step-by-step explanation: hope this helps.

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