Find the standard-form equation of the ellipse centered at the origin and satisfying the given conditions.An ellipse with vertices (0, ±9) and foci at 
.
A. 
+ 
= 1
B. 
+ 
= 1
C. 
+ 
= 1
D. 
+ 
= 1
Answer: A
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Multiply.(2a - 7b)(5a + 10b)
A. 10a2 - 15ab - 70b2 B. 10a2 - 15ab - 15b2 C. 10a2 + 20ab - 70b2 D. 10a2 - 35ab - 70b2
Solve.The speed of a vehicle varies inversely as the time it takes to travel a fixed distance. If a vehicle travels a fixed distance at 20 miles per hour in 35 minutes, how fast must it travel to cover the same distance in 25 minutes?
A. 
mph
B. 28 mph
C. 
mph
D. 
mph
?Use separation of variables to find the general solution of the differential equation.
?
?
A. ?
B. ?
C. ?
D. ?
E. ?
Read "What to Expect from This Text" and "Beginning the New Term: First Day" What are three alternative approaches to thinking algebraically?
A) verbal B) visual C) kinesthetic D) all the above E) none of these