IM BEING TIMED HELPP Jada is buying 4 stamps that cost $0.49 each. How can rounding be used to estimate the total cost of the stamps? Since each stamp is about $0.50, the total cost is approximately 4 +0.5 = $4.50. 0 Since she is buying about 10 stamps, the total cost is approximately 10 × 0.49 = $4.90. Since each stamp is about $0.50, the total cost is approximately 4 x 0.5 = $2.00. O Since she is buying about 10 stamps, the total cost is approximately 10 + 0.49 = $10.49.

ummm maybe $4.90, i don't really know how to incorporate rounding in this

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: it's a

step-by-step explanation: