4. If the determinant delta of a quadratic equation is positive, the equation has two real roots. If the determinant is negative, it has two imaginary roots. In this case, delta=b^2-4ac=(-1)^2-4*1*4=-15. Therefore, this equation has two imaginary roots.
Your answer is gonna be the second one!
0.4÷0.515=0.8 rounded to the nearest tenth.
5x - 18 + x = 90
6x = 108
x = 18 degrees
