An animal shelter spends $2.50 per day to care for each cat and $6.50 per day to care for each dog. Cooper noticed that the shelter spent $68.50 caring for cats and dogs on Tuesday. Cooper found a record showing that there were a total of 21 cats and dogs on Tuesday. How many cats were at the shelter on Tuesday?

pay attention in your classes and concentrate the best thing you can do to raise your test scores is to pay attention when you're supposed to be learning the material: in class!

take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.

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step-by-step explanation:

(x) - (y) = (1 + 4i)

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