Question 147959
1. Suppose the slope of line AB is zero. 
What is the slope of Line CD given that
a. Line CD is parallel to AB? : zero
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b. Line CD is perpendicular to AB?: undefined
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2. Suppose the slope of Line LT is undefined. What is the slope of Line RD given that
a. Line RD is parallel to line LT?: undefined
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b. Line RD is perpendicula to Line LT?: zero
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3. Tell whether each statement is always, sometimes , or never true.
a. The slope of the line with positive x- and y-intercepts is positive.: never
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b. The slope of the line with negative x- and y-intercepts is negative.: always
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4. Slopes are used in the planning and construction of the roof of a building. The slope of the roof is called pitch. A carpenter must know the pitch of a roof to cut rafters of the correct length.
A. The rise of the roof is 14 ft. and the span is 28 ft. Find the pitch.:14/14 
I am assuming the span is from one side of the roof to the other.
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B. The pitch of the roof Mang Itoy is building is 5 to 12. Half of the span is 16 ft. What is the rise? : 5/12 = x/16 ; x = 20/3 = 6 2/3
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C. About how long should a rafter for the roof decribed in letter A be?
length = sqrt(14^2+14^2) = 14sqrt(2) = 19.798 ft.
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Cheers,
Stan H.