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Why do interests rates on loans to be lower in a weak economy than in a strong one

Someone answer asap for ! the following statements are true about the coins calvin and sasha have collected. * calvin and sasha has the same amount of money. * calvin has only quarters. * sasha has dimes, nickels, and pennies * calvin has the same number of quarters as sasha has dimes. * sasha has $1.95 in coins that are not dimes. exactly how many quarters does calvin have?

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?