please do manual calculation on paper

Question 1 a. Solve the equation J k2 4 = k 4 b. Show the interval on a real number line c. Find all roots by using the quadratic formula 9x2 _ 123' + 4 = 0 Question 2 Suppose the cost to produce 10 units of a product is $40 and the cost of 20 units is $70. If cost \"c\" is linearly related to output \"q\" (cost is represented by y axis and the quantity of product is by x axis} a) Find a straight line equation that explain the linear relationship between cost and quantity. b) Find the cost to produce 35 units Question 3 Find the present value of $10,000 due in 10 years at a bank rate of 10% a) compounded monthly. b) 12% compounded semiannually