Suppose that income is a function of age. The following function represents the relation between average annual income I and age a. l(a) = -55a² +5119a-54,448 (a) For what age does average income I equal $30,000? (b) For what age does average income I equal $60,000? ... (a) Average income I is equal $30,000 for the age of (Use a comma to separate answers as needed. Round to the nearest year.) (b) Average income I is equal $60,000 for the age of (Use a comma to separate answers as needed. Round to the nearest year.) Next

The U.S. Federal income tax is a function of taxable income. Write T for the tax owed on a taxable income of I dollars. For tax year 2007, the function T for a single taxpayer was specified by th If your taxable income was of the Your tax is amount But not Over- over- over- $0 7,825 10% $0 7,825 31,850 $782.50 + 15% $7,825 31,850 77,100 4,386.25 + 25% $31,850 77,100 160,850 15,698.75 + 28% $77,100 160,850 349,700 39,148.75 + 33% $160,850 349,700 101,469.25 + 35% $349,700 What was the tax owed by a single taxpayer on a taxable income of $10,000? $ What was the tax owed by a single taxpayer on a taxable income of $35,000? $

The volume, V, of a sphere in terms of its radius, r, is given by V (r) = 7³. Express r as a function of V, and find the radius of a sphere with volume of 200 cubic feet. Round your answer for the radius to two decimal places. Enclose numerators and denominators in parentheses. For example, (a - b)/(1+n). Include a multiplication sign between symbols. For example, a * . r (V) = 640

Is this a function?