On Monday the US dollar could be exchanged for 0.7211 euros. This means that each US dollar was worth a little more than 72 euro cents. For the rest of the week the exchange figures were: Tuesday 0.7122, Wednesday 0.7201, Thursday 0.7102, and Friday 0.7212. Place the exchange rates in order from highest to lowest.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

step-by-step explanation:

no of data

divide by no of mode

addition

step-by-step explanation:

the answer is ! ?