The pH of a neutral solution is _________ on the pH

Find the value of 'a' and 'b' which satisfy the following equations:

9a + 7b = 30

4a - 5b = 62

The ratio of roots of the equation mx²+ nx + n = 0 isα/ β = a/b, then find the value of`sqrt(a/b)+sqrt(b/a)+sqrt(n/m)`

If (5√P - 7√Q) = 5, [1.5P = 4Q-(R/3)+9] and (√P/√Q) = 1.6, then find out the value of ‘R’.

If in two linear equations ax + by = c and dx + ey = f and a/d = b/e = c/f  then, which of the following is true about the two equations?

I. 2p² + 5p + 2 = 0               II. 2q² + 11 q + 14 = 0

I. p² - 365 = 364

II. q - √ 529 = √ 169

Find the area between the lines 18x +12y = 108, 9x  + 6y  = 27, x - axis and y -axis. 

If, x - y radic; 3 = 23 and radic; 3x + y = 35

Find the angle between both the lines when they intersect each other.

The equations 6x + my + 18 = 0 and 9x + 21y + 27 = 0 have a unique solution. Which of the following statements is definitely true?

If x - √3 y = 8 Find the slope in angle?