I need help with the answers to these questions please. They're giving me a hard time.

4.3.47 Find the equation of the tangent line to the graph of the given function at the given value of x. 2 9 f(x)=5x(x -4x+5) ;x=2 FD (Type an expression using x as the variable.) Bus Econ 4.3.53 EEQue 2 Suppose the demand for a certain brand of a product is given by D(p) = % + 450, where p is the price in dollars. If the price. in terms of the 0051 c. is expressed as NC) = 2c- 14, nd the demand function in terms of the cost. D(c) = Llfe SCI 4.3.63 Question Help ' '9 To test an individual's use of a certain mineral, a researcher injects small amount of a radioactive form of that mineral into the person's bloodstream The mineral remaining in the bloodstream is measured each day for several days. Suppose the 1 _ amount of the mineral remaining in the bloodstream (in milligrams per cubic centimeter) t days after the initial injection is approximated by 00) = E(4t+ 3) 1 I 2. Find the rate of change of the mineral level with respect to time for4 days. The rate of change of the mineral level with respect to time for 4 days is approximately milligrams per cubic centimeter per day. (Round to two decimal places as needed.) 5.2.27 Find the xvalues of all points where the function has any relative extrema. Find the value(s) of any relative extrema. x2-6x+9 x): x-6 Select the correct choice below and, if necessary, ll in any answer boxes within your choice. 0 A- The function has a relative maximum of D atx = D and a relative minimum of D at X: El. (Use a comma to separate answers as needed.) 3- There are no relative maxima. The function has a relative minimum of D at x= |:|. (Use a comma to separate answers as needed.) 0 C. There are no relative minima. The function has a relative maximum of D at X: D. (Use a comma to separate answers as needed.) 0 D. There are no relative extrema. 5.2.29 Find the xvalues of all points where the function has any relative extrema. Find the value(s) of any relative extrema. f(x) = x2 e X 6 Select the correct choice below and, if necessary, ll in any answer boxes within your choice. 0 A- There are no relative maxima. The function has a relative minimum of D at X: D. (Use a comma to separate answers as needed. Type an exact answer in terms of e.) O B- The function has a relative maximum of D at x = D and a relative minimum of D at x = D. {Use a comma to separate answers as needed. Type an exact answer in terms of e.) O C- There are no relative minima. The function has a relative maximum of D at X: D. (Use a comma to separate answers as needed. Type an exact answer in terms of e.) O D. There are no relative extrema