23. 15 books to 21 books Increan
24.
60 cars to 24 cars
decrease
Find the price
25.
The cost of making a blouse is $7. The manufacturer has a markup of 120% when selling to the
retailer. How much does the retailer pay for each blouse?
26.
A laptop has a regular price of $600. Find the total cost if it is on sale for 15% off.
27.
Suppose the subtotal of your restaurant bill is $18. How much tip would you leave if you tip 15%
28.
Josephine receives a commission of $8.0% on a sale of $230. What is her commission rate?
An account earns annual simple interest. Find the interest rate.
29. Interest earned: $3250
Principal: $5000
Interest rate:
Time:10 years
30.
An account earns annual simple interest. Find the balance of the account.
$5000 at 6% for 9 months

Ik it’s a lot but I really need help

In january 2010, you began a one-year study of tuberculosis (tb) in a subsidized housing community in the lower east side of new york city. you enrolled 500 residents in your study and checked on their tb status on a monthly basis. at the start of your study on january 1st, you screened all 500 residents. upon screening, you found that 30 of the healthy residents had been vaccinated for tb and therefore were not at risk. another 20 residents already had existing cases of tb on january 1st. on february 1st, 5 residents developed tb. on april 1st, 10 more residents developed tb. on june 1st, 10 healthy residents moved away from new york city and were lost to follow-up. on july 1st, 10 of the residents who had existing tb on january 1st died from their disease. the study ended on december 31, 2010. assume that once a person gets tb, they have it for the duration of the study, and assume that all remaining residents stayed healthy and were not lost to follow-up. is the subsidized housing community in the lower east side of new york city a dynamic or fixed population? briefly explain the rationale for your answer. dynamic population it can changeable people can move out and move in into the population of a subsidized housing what was the prevalence of tb in the screened community on january 1st? prevalence = 30/500 0.06= 6% what was the prevalence of tb on june 30th? prevalence= 40/450=0.08= 8.88% what was the cumulative incidence of tb over the year? cumulative incidence = number of new cases/number in candidate population)over specified time period 10/450 = 2.2% suppose that you wanted to calculate the incidence rate of tb in the study population. calculate the amount of person-time that would go in the denominator of this incidence rate. be sure to show your work.

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

Find the area of the surface obtained by rotating the curve z=4e^2y from y = 0 to y =1 about the y-axis. the area is square units