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determine which lines, if any are parallel?
a. line a passes through (-2,3) and (-5,-2)
b. line b passes through (1,2) and (-2,-2)
c. line c passes through (3,2) and (0,-2)

Four congruent circular holes with a diameter of 2 in. were punches out of a piece of paper. what is the area of the paper that is left ? use 3.14 for pi

2x minus y equals 6, x plus y equals negative 3

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?