# Posts by yadlay

Total # Posts: 9

**Geometry**

Consider again the sphere of radius 5 centered at (2, 3,−6). Describe the intersection of the sphere with the xz-plane. Write an equation (or equations) for this curve.

*April 17, 2010*

**math**

Two matrices can be multiplied only if their sizes are compatible. Suppose that U is an m × n matrix, and that V is a p × q matrix. In order for U•V to make sense, what must be true of the dimensions of these matrices? Although matrix multiplication uses dot ...

*April 15, 2010*

**geometry**

Reiny,help, how do I find the following (d) Find the sizes of the other two angles of triangle PQR. (e) Find the length of the median drawn to side PQ. (f) Find the length of the bisector of angle R. (g) Find the third side of another triangle that has a 5-inch side, an 8-inch...

*April 15, 2010*

**matrices**

Two matrices can be multiplied only if their sizes are compatible. Suppose that U is an m × n matrix, and that V is a p × q matrix. In order for U•V to make sense, what must be true of the dimensions of these matrices? Although matrix multiplication uses dot ...

*April 13, 2010*

**Mathmatics**

The highway department keeps its sand in a conical storage building that is 24 feet high and 64 feet in diameter. To estimate the cost of painting the building, the lateral surface area of the cone is needed. To the nearest square foot, what is the area?

*April 13, 2010*

**geometry**

Draw the unit circle and a first-quadrant ray from the origin that makes an angle theta with the positive x-axis. Let B be the point on this ray whose x-coordinate is 1, and let A = (1, 0). Segment AB is tangent to the circle. In terms of theta, find its length.

*April 13, 2010*

**geometry**

Draw the unit circle and a first-quadrant ray from the origin that makes an angle è with the positive x-axis. Let B be the point on this ray whose x-coordinate is 1, and let A = (1, 0). Segment AB is tangent to the circle. In terms of è, find its length.

*April 12, 2010*

**geometry**

A triangle has a 56-degree angle, formed by a 10-inch side and an x-inch side. Given that the area of the triangle is 18 square inches, find x.

*April 11, 2010*

**math**

A counterclockwise quarter-turn Q about the origin is applied to the point (x, y). What are the coordinates of the image point? Answer in the form Q(x, y) = (ax + by, cx + dy).

*April 11, 2010*

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