How do you write 1+0.9+0.08+0.001 in standard form

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Find the value of x for which line a is parallel to line b

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]