Find the vertices and foci of the ellipse.169x2 + 49y2 = 8281
A. Vertices: (±13, 0); Foci: (±2
, 0)
B. Vertices: (±7, 0); Foci: (±2
, 0)
C. Vertices: (0, ±13); Foci: (0, ±2
)
D. Vertices: (0, ±7); Foci: (0, ±2
)
Answer: C
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Type A grain containing 15.00% protein is mixed with type B grain containing 26% protein to make 1252 pounds of feed. The resulting mixture is to contain 23% protein. A: If we use ?a pounds of type A grain and ?b pounds of type B grain, write a system of two equations that determine the amounts of each that go into the mixture. Round your answers to two decimal places, if necessary.B: How much grain of each type goes into the mixture? Round your answers to two decimal places, if necessary.
What will be an ideal response?
Solve and graph the inequality and graph the solution.12a + 12 > 4(2a + 9)
A. (6, ?)
B. (-?, 12)
C. (-?, 6)
D. (12, ?)
Find all values of ? if ? is in the indicated interval and has the given function value. Give approximations to as many decimal places as your calculator displays.cos ? = 0.45271268; ? in the interval [0°, 360°)
A. 63.0821397° B. 63.0821397°, 116.91786° C. 26.9178603°, 153.08214° D. 63.0821397°, 296.91786°
Factor completely. State that the polynomial is prime if it cannot be factored.a3b - 6a2b2 + 8ab3
A. ab(a - 8b)(a - b) B. a(ab - 2)(ab - 4) C. ab(a - 2b)(a - 4b) D. ab(a - 2b)(a + 4b)