Alawn care service charges $10 plus $15 per hour to mow and fertilize lawns. write an expression for the total cost of having your lawn mowed and fertilized. then evaluate the expression for 4 hours.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

What are the solutions of the equation x4 + 6x2 + 5 = 0? use u substitution to solve.

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?