Find an equation of the parabola described and state the two points that define the latus rectum.Focus at (0, 4); directrix the line y = -4
A. x2 = 16y; latus rectum: (8, 4) and (-8, 4)
B. x2 = 4y; latus rectum: (2, 4) and (-2, 4)
C. y2 = 4x; latus rectum: (9, 2) and (-9, 2)
D. x2 = 16y; latus rectum: (4, 8) and (-4, 8)
Answer: A
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Solve the problem. Round your result to an appropriate number of significant digits.In order to measure the distance across a pond (from A to B), Raul made the measurements shown in the drawing. What is the distance?
A. 140 ft B. 190 ft C. 130 ft D. 210 ft
Solve the problem. Use a Venn diagram to find your answer.The subsets A, B, and C of the universe U satisfy the following conditions:n(A) = 85n(B) = 93n(C) = 87n(A ? B) = 17n(A ? C) = 19n(B ? C) = 13n(A ? B ? C) = 11n(
? 
? 
) = 171Find n(U).
A. 227 B. 312 C. 408 D. 398
Find the exact value of the expression.cos 
cos 
- sin 
sin 
A. 0
B. 1
C. -1
D. 
An apple orchard has an average yield of 38 bushels of apples/tree if tree density is 21 trees/acre. For each unit increase in tree density, the yield decreases by 3 bushels. Letting x denote the number of trees beyond 21/acre, find a function in x that gives the yield of apples.
What will be an ideal response?