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marishachu [46]
3 years ago
13

Which methods could you use to calculate th y-coordinate of the midpoint of a vertical line segment with ndpoints at (0,0) and (

0,-12)? check all that apply
A. divide -12 by 2
B. count by hand
C. divide 12 by 2
D. Add the endpoints
Mathematics
1 answer:
Damm [24]3 years ago
3 0
Answer: B count by hand
Explaining:
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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
Alexis wants to make a paperweight at pottery class. He designs a pyramid-like model with a base area of 100square centimeters a
STALIN [3.7K]

Answer:

The density of the material must be at least 1.5 g/cm³.

Step-by-step explanation:

The volume for a pyramid is given by the following formula:

V = (1/3)*Abase*h

Where V is the volume, Abase is the base area and h is the height. For Alexis's pyramid, we have:

V = (1/3)*100*6 = 200 cm³

Since he wants the paperweigth to have a mass of at least 300 grams, the density must be at least:

density = mass/volume = 300/200 = 1.5 g/cm³

5 0
3 years ago
Read 2 more answers
A test is worth 75 points. Multiple-choice questions are worth 2 points and
Likurg_2 [28]

Answer:

D. m+s=30

2m+3s=75

Step-by-step explanation:

let m be the no of multiple choice questions and s be the short questions then there are a total of 30 questions

m+s=30------A

there are 2 points for m(multiple choice questions) and 3 points for short questions (s)  and totalling to 75

2m+ 3s=75

7 0
3 years ago
Which fractions have a LCD of 30?
Tanzania [10]

Answer:

none of them.

Step-by-step explanation:

A. 7 and 4 can not go into 30

B & D are the same choice and LCD is 15

C. LCD is 15

3 0
3 years ago
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Write the equation of the line that passes through (1, 3) and has a slope of 2 in point-slope form
raketka [301]

Answer:

y-3= 2(x-1)

Step-by-step explanation:

1. The equation of a line in point slope form is y-y1= m(x-x1)

2. m=slope and (x1,y1) is the point the line passes through

3. The point the line passes through is (1,3)

4, The slope is 2

5. Therefore the answer is y-3=2(x-1)

3 0
3 years ago
Read 2 more answers
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