Explore BrainMass

# Geometry and Topology

### Coordinate Geometry - Circle

*For 1, find the standard form of the equation of the specified circle. 1. Endpoint of a diameter, (-4,-1), (4, 1) *For 2~4, write the given equation of the circle in standard form and sketch its graph. 2. X^2 + Y^2 -2X + 6Y - 15 = 0 3. 3X^2 + 3Y^2 - 6Y -1 = 0 4. 4X^2 + 4Y^2 -4X + 2Y -1

### Find the Equation of a Circle in Relationship to a Parabola

1. Find the equation of the circle that has its center at the focus of the parabola X^2 - 4x + 6y - 20 = 0 and that is tangent to the parabola at its vertex. Also sketch both curves.

### Determine Target Volume to Maintain a Profit Objective

For this question what needs to be calculated first? A company based in TX markets a range of deluxe fountain pens each initially priced at \$25. However, the company is planning a promotion and the price will be reduced to \$17. To promote the special price, an advertising campaign costing \$ 774 is scheduled. The company's fix

### A rectangular storage container with an open top is to have a volume of 10m3. The length of its base its twice the width. Material for the base costs of \$10 per square meter. Material for the sides costs \$6 per square meter. Find the cost of materials for the cheapest such container.

A rectangular storage container with an open top is to have a volume of 10m3. The length of its base its twice the width. Material for the base costs of \$10 per square meter. Material for the sides costs \$6 per square meter. Find the cost of materials for the cheapest such container.

### Golden ratio

The ancient Greeks thought that the most pleasing shape for a rectangle was one for which the ratio of the length to the width was 8 to 5, the golden ratio. If the length of a rectangular painting is 2 ft longer than its width, then for what dimensions would the length and width have the golden ratio?

### Cylindral coordinates and spherical coordinates

See attached page for problems

### Volume of Piece of Wood with a Conical Hole Drilled in it

Find the volume of a piece of wood - See the attached question file.

### Distance from point to a plane - What is the distance from the point D(1,-2,3) to the plane determined by the points A(1,0,2), B(3,-1,6), C(5,2,4)?

What is the distance from the point D(1,-2,3) to the plane determined by the points A(1,0,2), B(3,-1,6), C(5,2,4)?

### Poincare's model of Lobachevskian geometry

Poincare's model of Lobachevskian geometry was to say that points of the plane are represented by points in the interior of a circle and lines by both the diameters of the circle and the arcs of circles orthogonal to it. Draw a diagram(s) to illustrate his model and explain his theory.

### Tangent Plane Parametric Surfaces

Find an equation of the tangent plane to the given parametric surface at the specified point. 1.) r(u,v)= (u+v)i + ucos(v)j + vsin(u)k; (1,0,0)

### Square - Perimeter and Area

Find perimeter of a square if area is equal to 2x2 + 9x -5.

### Orthogonal and orthonormal basis

See attached file. Let W be the subspace of V4(R) spanned by the following set of vectors...

### Need to know the differences between regular Tic Tac Toe and cylindrical

A careful player can always guarantee at least a draw at regular tic tac toe. (a) Is this also true with cylindrical tic-tac-toe? Explain. (b) In cylindrical tic-tac-toe, can two players co-operate to play a draw? Explain. I know this must be simple but I can find nothing on it anywhere.

### Functions and Coordinate Geometry

Functions and Coordinate Geometry - (1) Find an equation of the line having the given slope and containing the given point m= , (6,-8) (2) Write an equation of the line containing the given point and parallel to the given line. Express your answer in the form y=mx+b (7,8); x+7y=5 ... ... (6) The table lists data regard

### Tangent plane

Please see the attached file - solution has to be in terms of z. Find an equation of the tangent plane to the given surface at the specified point.

### A=(LP)/2-L^2, gives the area of a rectangle of perimeter P and length L.

A=(LP)/2-L^2, gives the area of a rectangle of perimeter P and length L. Suppose that you have 600 feet of fencing which you plan to use to fence in a rectangular area of land. Choose any two lengths for a rectangle and find the corresponding area for each using the given equation. Include units and show all calculations. Which

### Relationship between volume and cone angle

Please help with the attached problem. Shown at the right is a cone with a slant height of 10 cm. Let's explore the relationship between the volume and the angle at the top of the cone....

### Equation to tangent

Find an equation of the tangent plane to the given surface at the specified point. Please see the attached file.

### Find the projection of the given vector

The material attached is from Inconsistent Systems and Projection. Please show each step of your solution. If you have any question or suggestion on my posting, please let me know.

### Decide if each of the following is a subspace

The material is from ABSTRACT VECTOR SPACE. Please kindly show each step of your solution. (The material is from ABSTRACT VECTOR SPACE. Please solve for parts (b) & (d). means the space of the collection of continuous functions on R which is differentiable 0 time. Please explain each step of your solution sufficiently.

### Volume of a solid

Find the volume of a solid generated by revolving the region enclosed by y=x^2, y=4x-x^2 about the line x=2

### Solve equilibrium of price, estimate population, and dimension of rectangular

Need assistance in solving the attached problems. My answers are falling short of the choices given in the problem. Please explain the steps to get answers. Thank you. 1. Find the equilibrium price. Suppose the price p of bolts is related to the quantity q that is demanded by: P=520-5q^2 where q is measured in hundred

### Connected Convex Subsets

Please see the attached file for the fully formatted problems. Let A and B be separated subsets of some Rk, suppose and , and define for . Put , . [Thus if and only if .] (a) Prove that Ao and Bo are separated subsets of R1 . (b) Prove that there exists such that . (c) Prove that

### Subspaces, Basis, Dimension and Rank

Please solve no. 12 and no. 30 in file scan005.jpg. For problem 30; when claiming that a vector is in a space, demonstrate correctness by giving the coefficients.

### Graphs represents the angle in standard position

Csc, cot, sin, tan See the attached file.

### Minimizing cost of materials to build an aquarium

The base of an aquarium with given volume V is made of slate and the sides are made of glass. If slate costs five times as much (per unit area) as glass, find the dimensions of the aquarium that minimize the cost of the materials.

### Van Hiele's levels importance with students on geometric concepts

Why are each one of van Hiele's levels important when working with students on geometric concepts? level 0: visualization level 1: analysis level 2: informal deduction level 3: deduction level 4: rigor

### Maximizing Profit and Minimizing Surface Area of a Cylinder

9) A shop can sell 30 radios at \$20 each, per week. For every \$1 increase in the price there will be a loss of one sale per week. How much should the shop charge in order to make the maximum profit If the cost to make each radio is \$10 10). A closed can (top and bottom), in the shape of a cylinder, is to hold 2000pi cm^3 of

### Maximizing the Volume of a Box

A box is made from a sheet of metal that is 8 meters by 10 meters, by removing a square from each corner of the sheet and folding up the sides. Find the width of the square to removed in order to have a box of maximum volume.