Why should maths be compulsory​

It's compulsory because just like math it forms the basis of all other subjects. Making the study of those other subjects than if they were equipped with language skills in the language of instruction. Math/s is the universal language relevant in teaching/learning of all fields including art.

Step-by-step explanation:

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.