Please explain these problems.

Question 19 Not yet answered Points out of 4.00 \\ Remove flag The cost function for producing x units of a product in a month is given by C(a) = 15x + 1875, where the cost is measured in dollars. The product sells for $30 per unit. How many units per month must be produced and sold to break even?Question 12 Not yet answered Points out of 4.00 \\ Remove flag A quarter is dropped from a height of 120 feet above the ground. The position of the quarter after t seconds is given by the function s(t) = -16t2 + 120 How long will it take for the quarter to reach the ground? Round answer to three decimal places.Question 11 Not yet answered Points out of 4.00 | Remove flag The cost function for producing x units of a product is given by C(x) = 0.05x2 + 26x + 78, where the cost is measured in dollars. The revenue function is given by R(ac) = 15 + 2, where the revenue is measured in dollars. Find the marginal cost when x = 38.Question 9 Not yet answered Points out of 4.00 t7 Flag question Given the following function ac) :332$+7 Find the slope of the secant line on the interval [-1, 4]. Question 4 Not yet answered Points out of 4.00 | Remove flag The cost function for producing x units of a product in a month is given by C(x) = 16x + 2320, where the cost is measured in dollars. The product sells for $32 per unit. Find the profit from the sale of 175 units per month.Question 7 Not yet answered Points out of 4.00 \\ Remove flag A ball is thrown into the air from a height of 15 feet above the ground. The height (position) of the ball above the ground after t seconds can be found using the function s(t) = -16t2 + 41t + 15 Write answer in decimal form, rounded to three decimal places. What is the maximum height of the ball? Include the units.Question 22 Not yet answered Points out of 4.00 \\ Remove flag The cost function for producing x units of a product is given by C(x) = 0.05x2 + 26x + 78, where the cost is measured in dollars. The revenue function is given by R(a) = 15 + x2, where the revenue is measured in dollars. Find the profit from the sale of 80 units.Question 23 Not yet answered Points out of 4.00 \\ Remove flag A quarter is dropped from a height of 134 feet above the ground. The position of the quarter after t seconds is given by the function s(t) = -16t2 + 134 Find the velocity of the quarter after 1.5 seconds