Solve. {y=x−75x+2y=7 use the substitution method. (3, −4) (−1, −8) (7, 0) (0, −7)

What is the number 321,000,000 in scientific notation? also what is the number? ?

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8