The quantity demanded for a certain brand of portable CD players is 400 units when the unit price is set at $80. The quantity demanded is 1,400 units when the unit price is $30. Find the demand equation.
e. p=0.05x-100
Mathematics
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250 students in a math class take the final exam. The scores on the exam have an approximately normal distribution with mean ? = 75 and standard deviation ? = 10.Approximately how many students had test scores with standardized values between -0.675 and 1?
A. 107 B. 188 C. 147 D. 85 E. none of these
Mathematics
Add or subtract. Write the answer in lowest terms.
+ 
- 
A. 
B. 
C. 
D. 
Mathematics
Find the degree of the polynomial.-15x4 + 2x3 + 2x - 4x5 - 3
A. degree 5 B. degree 3 C. degree -15 D. degree 4
Mathematics
For a triangle with side lengths 1.5 feet, 2 feet and 3 feet, the area of the triangle is:
(a) Approximately 1.3 feet2 . (b) Approximately 4.5 feet2 . (c) Approximately 1.5 feet2 . (d) Approximately 4 feet2 . (e) None of these are correct.
Mathematics