What are the roots of the equation x2 + 18x + 90 = 0 in simplest a + bi form?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

Nikolas calculated the volume of the prism. his work is shown below.

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park what is the unit rate and what does it represent in the context of the situation?