Describe the solution set as an inequality and in interval notation. |5x + 4| > 5

A. x < -   or x >  ? 
B. -  < x < 
C. -  < x < 
D. x < -   or x >  ? 


Answer: D

Mathematics

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Establish the identity. = 

What will be an ideal response?

Mathematics

Find the value of the expression without using a calculator.log2(log416)

A. 4
B.
C. 2
D. 1

Mathematics

The cost of controlling emissions at a firm goes up rapidly as the amount of emissions reduced goes up. Here is a possible model.

?

?
where x is the reduction in sulfur emissions, y is the reduction in lead emissions (in pounds of pollutant per day), and C is the daily cost to the firm (in dollars) of this reduction. Government clean-air subsidies amount to $600 per pound of sulfur and $50 per pound of lead removed. How many pounds of pollutant should the firm remove each day to minimize the net cost (cost minus subsidy)?
?

A. 3.5 lb of sulfur and 2 lb of lead
B. 6 lb of sulfur and 1 lb of lead
C. 3 lb of sulfur and 1 lb of lead
D. 1.9 lb of sulfur and 3.5 lb of lead
E. 1 lb of sulfur and 3 lb of lead

Mathematics

Solve the problem.Express the total shaded area as the product of two binomials.(The figures are not drawn to scale.)

A. (2x + 5)2 B. (5x + 2)(5x - 2) C. (5x + 2)2 D. (5x + 2)(25x2 - 20x + 4)

Mathematics