To rent a certain meeting room, a college charges a reservation fee of $19 and an additional fee of $4 per hour. the chemistry club wants to spend at most $39 on renting the room. what are the possible numbers of hours the chemistry club could rent the meeting room?

use t for the number of hours.
write your answer as an inequality solved for t.

If you are trying to move an attached term across the equal sign (=), what operation would you use to move it?

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

15 there is a line that includes the point 0,10 and has a slope of 7/4. what is it’s equation in slope intercept form