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xxMikexx [17]
3 years ago
14

If cos=20/29 and it is in the 4th quadrant, what is tan2x?

Mathematics
1 answer:
Harrizon [31]3 years ago
4 0
Think it's done like this but im not sure if the tan2x part is correct

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The equation of the tangent to the curve x^2 = 4y at the point on the curve where x=-2 is?
aleksandrvk [35]
x^2 = 4y \Rightarrow y= \frac{x^2}{4}
\frac{dy}{dx} = \frac{2x}{4} =  \frac{x}{2}

(x = -2) \frac{dy}{dx} = \frac{x}{2} =  \frac{-2}{2} = -1
(x = -2) y= \frac{x^2}{4}= \frac{(-2)^2}{4}  = 1

y-y_1=m(x-x_1)
y-1 = -1(x--2)

y-1 = -1(x+2)
y-1 = -x-2
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7 0
3 years ago
Read 2 more answers
What is the value of x in the equation <img src="https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B5%7Dx%20-%5Cfrac%7B2%7D%7B3%7D" id="Te
SVEN [57.7K]

Answer:

x= 200

Step-by-step explanation:

The given equation is:

1/5 x - 2/3 y = 30

The value of y is 15

Put the value of y in the given equation:

1/5 x - 2/3(15) = 30

1/5 x- 10 = 30

Take the L.C.M of the denominator

x-50/5 = 30

Move the denominator to the R.H.S

x-50 = 30*5

x-50 = 150

Combine the like terms

x= 150+50

x = 200

The value of x is 200...

5 0
3 years ago
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Select the correct answer from the drop-down menu.<br> Fill in the missing number in the equation.
noname [10]

Answer:

8

Step-by-step explanation:

a A + b A where A is a matrix and a and b are scalars

( a+b) A

3+5 \left[\begin{array}{cc}-1&2\\4&-5\end{array}\right] = 8\left[\begin{array}{cc}-1&2\\4&-5\end{array}\right]

         

7 0
3 years ago
Which explanation correctly solves this problem?
Molodets [167]
Hello!

The Correct Answer for this Question would be:

"<span>Start with 10.5. Add 3.5 and 10.5. Add 2.25 to the sum. Then add 5 to the answer."

In Other Words, Option "B".

Hope this Helps! Have A Wonderful Day! :)</span>
8 0
3 years ago
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Select all of the following that are quadratic equations.
goldenfox [79]

Answer:

1. x² + 3x - 5 = 0

2. x² - x = 3 x + 7

4. 7x² + 14x = 0

Step-by-step explanation:

A Quadratic equation takes the form;

ax² + bx + c = 0

a, b, c are constants and a cannot be 0.

Options 1 fits this;

x² + 3x - 5 = 0

Option 2 fits this as well;

x² - x = 3 x + 7  

x² -x - 3x - 7 = 0

x² - 4x - 7 = 0

Option 4 fits this as well if c = 0.

7x² + 14x + 0 = 0

8 0
3 years ago
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