Lavonne estimated 38% of 63 by rounding 38% up to 40% rounding 63 up to 70 and then multiplying 70 by 0.4 to get 28 . is her estimate reasonable

her answer is not reasonable

Step-by-step explanation:

her rounding 38 to 40 is correct

her rounding 63 to 70 is incorrect because it is 4 and below

so it would be rounded to 60 not 70.

hope this helps please make brainliest

Her estimation is not reasonabl.fdgfdgfdgfd

Step-by-step explanation:

Since we have given that

38% of 63.

He estimated 38% as 40%

and

63 is estimated as 70.

and then he multiplied 70 by 0.4 and get 28.

But her estimation is not reasonable.

63  must be estimated as 60 instead of 70.

We always check the last digit, if is more than 5, then it is rounded off to next digit.

If the last digit is less than 5, then it is rounded off to that digit itself.

So, In case of 63, last digit is 3 which is less than 5 so, it will becomes 60.

So, 40% of 60 is given by

Hence, her estimation is not reasonable.

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