Adrian's sister took 15 marbles out of a bag and then gave the rest to her brother. the bag her brother received had 35 marbles in it. how many marbles were in the bag to begin with? solve this equation: n - 15 = 35

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.