David W.

Tutor for two years, software developer for nine years, Currently heading my own company

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PHP Programming

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Question:

What is the difference between the unset() and unlink() functions?

David W.

Answer:

Unset() is used to delete a variable from memory and is used for variables only. Unlink() is used to delete a file that is in the file handle.

HTML Programming

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Question:

What is the HTML element for the largest heading (standard)?

David W.

Answer:

<h1>. There are six headings ranging from <h1> to <h6>. <h1> is the tag with the biggest heading and is usually used for titles.

Algebra

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Question:

Find the equation in slope-intercept form of the line that passes through the point (3, -3) and has a slope equal to 5.

David W.

Answer:

Slope-intercept form is y = mx+b. m is the slope and b is the y-intercept. We are already given the slope: m = 5. We need to find the y-intercept next. We are given a point, so we will use the point slope formula given the point (x1, y1) = (3, -3). Point Slope: y - y1 = m(x - x1) Since (x1, y1) = (3, -3), x1 = 3, and y1 = -3. m = 5. y - (-3) = 5(x - 3) <-- plug in x1, y1, and m y + 3 = 5x - 15 <-- distribute 5(x-3) = 5x - 15 y = 5x - 18 <-- subtract 3 on both sides. Your b is -18, and therefore your equation is y = 5x - 18

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