SOLUTION: 20. Suppose that income is a function of age. The following function represents the relation between average annual income l and age a. l(a)=-55a^2+5117a-54,421 (A) For wha

Question 1114738: 20.
Suppose that income is a function of age. The following function represents the relation between average annual income l and age a.
l(a)=-55a^2+5117a-54,421
(A) For what age does average income l equal $40,000?
(B) For what age does average income l equal $60,000?
(a) Average income l is equal $40,000 for the age of?
Answer by josgarithmetic(39626) (Show Source): You can put this solution on YOUR website!
For part (A)

General solution for quadratic equation:
AMP Parsing Error of [a=(-5117+- sqrt(5117^2-4*(-55*(-94421)))/(-2*55)]: Invalid expression. Closing bracket expected at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 187. .

Compute this and take the value which makes sense.
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