Which is not a correct way to represent the relation "the second number is 1 less than three times the first number"?

y = 1 - 3x
y = 3x + (-1)
y = -1 + 3x
y = 3x - 1

The actual length of side t is 0.045 cm. use the scale drawing to find the actual side length of w. a) 0.06 cm b) 0.075 cm c) 0.45 cm d) 0.75 cm

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.