6th grade mathematics rates & ratios

dont answer if you dont know

which is the best buy: $4.08 for a 16-ounce box of cereal, $4.50 for an 18-ounce box of cereal, or $5.39 for a 22-ounce box of cereal?

$4.08/16 ounces: $0.255

$4.50/18 ounces: $0.25

$5.39/22 ounces: $0.245

The best buy would be $4.50 for an 18-ounce box of cereal.

You want to find the cheapest per 1 ounce

so just divide cost by ounces

4.08/16=0.225 per ounce
4.50/18=0.250 per ounce
5.39/22=0.245 per ounce
4<5
so cheapest is the 22oz box be

A parabola, a graph of a quadratic function, cannot have a maximum vertex and a minimum vertex at the same time because of the shape of the graph.  A parabola is a u-shaped graph.  The vertex of the parabola is the point where the u changes direction; if it was increasing, it starts to decrease, and if it was decreasing, it starts to increase.  Since a parabola only changes direction once, there will either be a minimum or a maximum, not both.