Santiago walked 500 m per day, every day for
one week. How many
kilometers did he walk
all together?

500 X 7 = 3500, 3500m = 3.5 km

She walked 3.5 km in 1 week.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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answer: when you burn wood, the carbon reacts with the oxygen in the air to create ash and smoke. that is a permanent change you cannot undo that.

step-by-step explanation: