Which expression is equivalent to:
25a + 5b - 13?

20a + 5a + b - 13
20(5a+5b) - 13
5(5a+b) - 13
30ab - 13

Aschool had an election where the candidates received votes in the ratio 1: 2: 3. if the winning candidate received 210 votes, how many total people voted in the election?

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.

Segment wx is shown explain how you would construct a perpendicular bisector of wx using a compass and a straightedge