Help with these 5 questions please i will mark as brainlist!!

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.