Si Random's user avatar
Si Random's user avatar
Si Random's user avatar
Si Random
  • Member for 4 years, 4 months
  • Last seen more than 2 years ago
  • Indiana, PA, United States
14 votes
7 answers
9k views

What's the best way to find a perpendicular vector? [duplicate]

6 votes
5 answers
916 views

What is the sum of the following infinite series?

3 votes
1 answer
125 views

Is there a better/easier way to solve this matrix?

3 votes
2 answers
1k views

Evaluating $\frac{dg}{dθ}$ at $(r,θ)=(2\sqrt{2},\frac{π}{4})$ where $g(x,y)=\frac1{x+y^2}$ using chain rule?

3 votes
5 answers
4k views

What is the best way to explain why Matrix Multiplication is not commutative?

3 votes
3 answers
4k views

How to solve for unknown variables in a matrix?

3 votes
1 answer
2k views

How do I determine from a picture of a vector field if it's a possible formula for the vector field and conservative or not?

2 votes
2 answers
1k views

What is the image of a vector?

2 votes
1 answer
3k views

Prove that if $A$ is an invertible $n × n$ matrix, then the columns of $A$ span $\mathbb R^n$

2 votes
1 answer
1k views

How do I find the minimum and maximum of a multivariable function given two constraints?

2 votes
2 answers
2k views

How do I use cross products to find the area of the quadrilateral in the $𝑥𝑦$-plane defined by $(0,0), (1,−1), (3,1)$ and $(2,8)$?

2 votes
2 answers
5k views

How to find a normal vector given a plane with the following equation: $4(𝑥−8)−14(𝑦−3)+6𝑧=0$

2 votes
2 answers
2k views

How do I convert this equation to the standard form of a circle?

1 vote
1 answer
3k views

Vector parametrization of the line that passes through two vectors.

1 vote
1 answer
4k views

How to find the cosine of the angle between the plane through $𝑃=(3,0,0), 𝑄=(0,7,0)$, and $𝑅=(0,0,6)$ and the $𝑦𝑧$-plane?

1 vote
5 answers
3k views

The plane $𝑥/4+𝑦/4+𝑧/7=1$ intersects the $𝑥-$ , $ 𝑦-$ , and $𝑧$- axes in points $𝑃, 𝑄, 𝑅$. Find the area of the triangle $Δ𝑃𝑄𝑅$.

1 vote
4 answers
2k views

How to determine the span of two vectors: $(4,2)$ and $(1, 3)$

1 vote
1 answer
2k views

How to find a normal vector of a vector?

1 vote
1 answer
983 views

Finding a Parametrization of a straight line with a projection on a plane

1 vote
2 answers
169 views

True or False: An equation of the form $ax_1 + bx_2 + cx_3 = d$ can be visualized as a line in $R^3$.

1 vote
1 answer
39 views

Help with conceptual vector and matrix related questions. [closed]

1 vote
1 answer
3k views

How to represent a number with a repeating decimal as a ratio of integers [duplicate]

1 vote
1 answer
220 views

Find the values of $p$ for which the series is convergent. [duplicate]

1 vote
1 answer
68 views

can someone check my answers and make sure i'm right [closed]

1 vote
1 answer
689 views

How to find bounds when doing a double integral?

1 vote
2 answers
468 views

Any general direction on visualizing functions in 3 dimensions?

1 vote
1 answer
427 views

How do I find the average rate of change of two points in a contour map?

1 vote
1 answer
494 views

How to do a double integral for a parallelogram?

1 vote
1 answer
261 views

How do I find the bounds of integration for a triple integral?

1 vote
1 answer
233 views

How do I write another vector as a linear combination without row reducing?