Round 342.296269789 to 2 decimal places.

342.29

Step-by-step explanation:

You take away the other decimal places.

342.30

Step-by-step explanation:

Look at the number after the second decimal place. Is it 5 or over? Yes, so you must increase the second decimal place number by 1. 9+1= 10. You can't have a 2 digit number occupy one digit, so you increase the first decimal place by one and make the second one 0.

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

answer: a and b

step-by-step explanation: