-1/2 - (-5/9) as a fraction in simplest form. I am very confused on how to do this please help me understand.

What is the value of x? enter your answer in the box. x =

Assume the availability of a function is_prime. assume a variable n has been associated with positive integer. write the statements needed to compute the sum of the first n prime numbers. the sum should be associated with the variable total. note: is_prime takes an integer as a parameter and returns true if and only if that integer is prime.\

Prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle., using rectangle method 1.