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choli [55]
3 years ago
12

Choice D is 100 plz help soon as possible

Mathematics
1 answer:
telo118 [61]3 years ago
7 0

Answer:

a:78.5 square inches

Step-by-step explanation:

a=3.14*5^2

 =3.14*25

a=78.5 sq inches

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Find a vector equation and parametric equations for the line segment that joins p to q. p(1, −1, 7), q(7, 6, 1) vector equation
AleksAgata [21]
Answers: 

- vector equation: r(t) = <1 + 6t, -1 + 7t, 7 - 6t> 
- parametric equations:   
      x = 1 + 6t
      y = -1 + 7t
      z = 7 - 6t

Explanation:

To obtain the vector equation, we first get a vector v that is parallel to the line. To get the vector v, we subtract p from q. So,

v = q - p
   = (7,6,1) - (1,-1,7)
v  = (6, 7, -6)

The vector equation of the line is given by

r(t) = v_0 + tv

Where

v_0 = a point in the line (we choose point p(1,-1,7))

So, the equation of the line joining p and q is given by

r(t) = v_0 + tv&#10;\\ \indent = \left \langle 1, -1, 7 \right \rangle + t\left \langle 6, 7, -6 \right \rangle&#10;\\ \indent = \left \langle 1, -1, 7 \right \rangle + \left \langle 6t, 7t, -6t \right \rangle&#10;\\ \indent \boxed{r(t) = \left \langle 1 + 6t, 1 + 7t, 7 - 6t \right \rangle }

In the parametric equation of the line, we just need to get the x, y and z coordinates in the vector equation.

Since the vector equation is given by 

r(t) = \left \langle 1 + 6t, 1 + 7t, 7 - 6t \right \rangle

The parametric equations of the line are given by:

x(t) = 1 + 6t&#10;\\y(t) = 1 + 7t&#10;\\z(t) =  7 - 6t


4 0
3 years ago
What is the rectangular equivalence to the parametric equations?
Usimov [2.4K]

Answer:

\left(\frac{x-2}{3} \right)^{2}+\left(\frac{y+1}{2} \right)^{2} = 1 (An ellipse)

Step-by-step explanation:

Let consider the following trigonometric identity:

\sin^{2}\theta + \cos^{2}\theta = 1

Each trigonometric function is cleared respectively in given parametric equations:

\cos \theta = \frac{x-2}{3} and \sin \theta = \frac{y + 1}{2}

The equivalent expression in rectangular form is:

\left(\frac{x-2}{3} \right)^{2}+\left(\frac{y+1}{2} \right)^{2} = 1

Which represents an ellipse.

6 0
4 years ago
The salary of teachers in a particular school district is normally distributed with a mean of $50,000 and a standard deviation o
Westkost [7]

Answer:

54,900

hope this helps!!

3 0
3 years ago
Find the percent.<br> 2% of 2,100 tiles.
wel

Answer:

42

Step-by-step explanation:

Write 2% as

2

100

Since, finding the fraction of a number is same as multiplying the fraction with the number, we have

2

100

of 2100 =

2

100

× 2100

Therefore, the answer is 42

If you are using a calculator, simply enter 2÷100×2100 which will give you 42 as the answer.

7 0
3 years ago
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If f(x) is 4x-3 what is (f^-1of) (10)
muminat
f(x)=4x-3\\&#10;y=4x-3\\&#10;4x=y+3\\&#10;x=\frac{1}{4}y+\frac{3}{4}\\&#10;f^{-1}(x)=\frac{1}{4}x+\frac{3}{4}\\\\&#10;f^{-1} \circ f=\frac{1}{4}(4x-3)+\frac{3}{4}\\&#10;f^{-1} \circ f=\frac{4x}{4}-\frac{3}{4}+\frac{3}{4}\\&#10;f^{-1} \circ f=x
4 0
4 years ago
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