Solve the equation and express each solution in a + bi form.
X^4-8x^2-48=0

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.

Stefanie is painting her bedroom. she can paint 2 1/3 square feet in 4/5 of an hour. how many square feet can she paint in one hour?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?