Matemática tema: máximacion y minimizacion

el dueño de un campo de 10 hectáreas planta limoneros sabe estadisticamente que si planta 40 limonero por hectárea cada uno de ello le dará 120 limones pero por cada limonero de más que plante esto dara 2 limones
cuantos limones deberé plantar para obtener la mayor cantidad de limones? ?
por me ayudan es para mañ

What is the missing constant term in the perfect square that starts with x^2 -20x

James is playing his favorite game at the arcade. after playing the game 3 times, he has 8 tokens remaining. he initially had 20 tokens, and the game costs the same number of tokens each time. the number tt of tokens james has is a function of gg, the number of games he plays

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth