Graph the system of linear inequalities and indicate the solution set.x - y ? 4x + y ? 10
A. 
B. 
C. 
D. 
Answer: C
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The demand equation is 
.
?
Compute the elasticity of demand and determine whether the demand is elastic, unitary, or inelastic at 
.
?
A. 
; elastic
B. ?
; inelastic
C. ?
; inelastic
D. 1; unitary
Solve the problem.The pH of a solution ranges from 0 to 14. An acid has a pH less than 7. Pure water is neutral and has a pH of 7. The pH of a solution is given by 
where H+ represents the concentration of the hydrogen ions in the solution in moles per liter. Find the pH if the hydrogen ion concentration is 
A. 2.8 B. 3.8 C. 2.2 D. 3.2
Factor the polynomial completely. If a polynomial cannot be factored, state that it is irreducible.15x2 - 65x - 50
A. 5(3x + 2)(x - 5) B. (15x + 10)(x - 5) C. irreducible D. 5(3x - 2)(x + 5)
Factor the difference of two squares.(81x4 - 16)
A. (3x + 2)2(3x - 2)2 B. (9x2 + 4)(3x + 2)(3x - 2) C. (9x2 + 4)(9x2 - 4) D. (9x2 + 4)(9x2 + 4)