Which of the following equations describes the graph?
y = x2 - 5x+2
y = x – 5x-2
y = 2x2 - 5x+2
y=2x² - 4x + 2

answer:

It is the FIRST equation that matches our expectations.

Step-by-step explanation:

The y-intercept of the graph is (0, 2), so we can immediately eliminate the function y = x - 5x - 2 (which has a y-intercept of (0, -2).

Next, we look at the remaining functions and determine which has axis of symmetry equal to x = 2.5 approx.:

First equation:  y = x^2 - 5x + 2; here a = 1 and b = -5, so the axis of symmetry is x = -(-5)/(2) = 2.5.  This matches our expectation.

Third equation:  y = 2x^2 - 5x + 2:  here a = 2 and b = -5, so the axis of symmetry is at x = -(-5)/[2*2]), or x = 5/4.  Does not match expectations.

Fourth equation:  y = 2x^2 - 4x + 2; here a = 2, b = -4, so that the axis of symmetry is x = -(-4)/[2*2], or x = 1.  Does not match expectations.

It is the FIRST equation that matches our expectations.

water molecules will move from the side of higher water concentration to the side of lower concentration until both solutions are isotonic. at this point, equilibrium is reached. in an isotonic solution, the flow of water in and out of the cell is happening at the same rate.

hope this < 3