39 i need ! 2 !
1) the area of a rectangle is 8w + 18. use your width expression to find the width of the rectangle when w = 1.25 feet. show your work.
2) the sixth grade band students are selling magazines to raise money for new instruments. as a reward for selling, the students earn points to spend on prizes. each student gets 25 points to start with, and then they earn an additional 5 points for each magazine they sell. if m represents the number of magazines a student sells, write an expression to represent the total number of points the student has. determine how many points a student has if they sell 6 magazines. show your work.
note: the width expression is just the way how you yourself does it, no specific way is required))
you.

The biologist has a second culture to examine. she knows that the population of the culture doubles every 15 minutes. after 1 hour and 15 minutes, her assistant found that 80,000 bacteria were present. a) what was the size of the initial population? b) predict the size of the culture at t=3 hours. what was the size of the population at 40 minutes? explain and justify your answers. c) create a graph of the population as a function of time. find an equation that can be used to predict the size of the population at any time t. d) examine the rate at which the bacteria culture is growing. how fast is the culture growing after 1 hour? after 1.5 hours? after 2 hours? use a time interval of h = 0.01 hours to estimate these rates. interpret these rates in terms of the context of the problem situation. how do these three rates compare?