Write a quadratic equation whose roots are 1+8i and 1-8i

Given that abcd is a rhombus, what is the value of x?

The party planning committee has to determine the number of tables needed for an upcoming event. if a square table can fit 8 people and a round table can fit 6 people, the equation 150 = 8x + 6y represents the number of each type of table needed for 150 people.

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.