Rafeal counted a total of 40 white cars and yellow car. therebwere 9 times as many white cars as yellow cars. how many white cars did rafeal count?

360 that's the answer

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since the cosine is the ratio of the adjacent side to the hypotenuse, you can see that cos 60° = ½. answer. according to the property of cofunctions (topic 3), sin 30° is equal to cos 60°. sin 30° = ½.