Solve and check.On a clear day, the distance d (in miles) that a lookout on a ship can see to the horizon from height h (in feet) can be approximated by the formula 
How high must a lookout climb to see a ship 20.5 miles away? Round to the nearest foot.
A. 130 ft
B. 756 ft
C. 114 ft
D. 420 ft
Answer: A
Mathematics
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Solve the problem.Find the number of units that must be produced and sold in order to yield the maximum profit, given the following equations for revenue and cost:R
= 5xC
= 0.01x2 + 0.7x + 40.
A. 285 units B. 215 units C. 430 units D. 570 units
Mathematics
Solve the equation.y - 1.2 = 2.3
A. 3.5 B. 1.3 C. 3.3 D. 1.1
Mathematics
Perform the indicated operation. Write your result in a + bi form.
A. 
- 
i
B. 
+ 
i
C. 
+ 
i
D. 
- 
i
Mathematics
Perform the division. Write the answer with positive exponents.(56x8 + 63x6 + -28x3) ÷ (7x3)
A. 56x5 + 63x3 - 28 B. 8x8 + 9x6 - 4x3 C. 8x5 + 9x3 - 4 D. 8x5 + 63x6 - 28x3
Mathematics