Find an equation for the parabola described.Vertex at (2, -1); focus at (4, -1)
A. (y + 1)2 = -8(x - 2)
B. (x + 2)2 = -12(y - 1)
C. (y + 1)2 = 8(x - 2)
D. (x + 2)2 = 12(y - 1)
Answer: C
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Solve the problem.How much pure acid should be mixed with 4 gallons of a 50% acid solution in order to get an 80% acid solution?
A. 6 gal B. 16 gal C. 2 gal D. 10 gal
Determine whether the given number is a solution of the equation. 
+ x = 3; x = 
A. No B. Yes
Solve the problem.John (whose line of sight is 6 ft above horizontal) is trying to estimate the height of a tall oak tree. He first measures the angle of elevation from where he is standing as 35°. He walks 30 feet closer to the tree and finds that the angle of elevation has increased by 12°. Estimate the height of the tree rounded to the nearest whole number.
A. 90 ft B. 86 ft C. 61 ft D. 67 ft
Round the number to the nearest ten, nearest hundred, and nearest thousand.8019
A.
| Ten | 8020 |
| Hundred | 8100 |
| Thousand | 8000 |
B.
| Ten | 8020 |
| Hundred | 8000 |
| Thousand | 8000 |
C.
| Ten | 8010 |
| Hundred | 8100 |
| Thousand | 9000 |
D.
| Ten | 8010 |
| Hundred | 8000 |
| Thousand | 8000 |