help me solve these. please

DingBat Knobs manufactures door knobs. The graph of the cost lnction is shown below (Cost is in dollars): 3000 2500 2000 I500 1000 500 10 20 3040 50 60 70 80 901% a. What is the xed costs to manufacture door knobs? $:] b. What are the variable (per knob) costs to manufacture door knobs? $:] c. What is the cost to manufacture 30 door knobs? 3% :l (1. Going by just the graph, what is the domain of C (:13)? Use inequliaties to answer (and the variable 3:). :1 Preview e. Going by just the graph, what is the range of C(33)? Use inequliaties to answer (and the variable y). 1:] Preview The Trussville Utilities uses the rates shown in the table below to compute the monthly cost, C(x), of natural gas for residential customers. Usage, x, is measure in cubic hundred feet (CCF) of natural gas. Base charge $9.00 First 1000 CCF $0.10 per CCF Over 1000 CCF $0.20 per CCF a. Find the charge for using 500 CCF. b. Find an expression for the cost function C(a) for usage under 1000 CCF. C(a) = Preview c. Find an expression for the cost function C(a) for usage over 1000 CCF. C(a) = PreviewThe income tax code in Bozonia states that the tax liability T(x) (in dollars) on x dollars of taxable income is: 0.05x if 0 > 30000 Find the tax liability for taxable incomes of $30,000 and $40,000: Tax on $30,000: $ Tax on $40,000: $ Graph the function. 2800- 2400- 2000- 1600+ 1200- 800- 400 10000 20000 30000 40000 500 Clear All Draw: LineThere is an income tax on the planet Bozone. Both annual income, 3:, and income tax, T[:c), are measured in the local currency, the Bozat ( Br} ). If the annual income a: