pleaseeeee helpppp. Briefly describe how musical notation changed over the centuries

Forensic scientists can use which of the following to test for the presence of drugs in a human?BloodHairSalivaAll of the above Johnson has 19 bowls of ice cream he gives away d ice cream bowls write the expression that shows the number of ice cream bowls are left? Which choice describes an equationthat has a solution set of"All real numbers"?3(x + 1) = 3x + 3 Question 13 options:What is the slope of the line of the graph? A middle school principal wants to change the lunch menu. The principal surveys the students to determine how the students would feel about the change. What served method will produce the best repersentative sampleA)survey every 5th student who rides in a car to schoolB)survey 3 randomly selected students from every homeroom C) survey every 10 7th grade student during lunch D) survey 5 randomly selected students find the second derivative of the parametric equation x(t)=sin t and y(t)=cos t Which three pairs of concept best describes the roaring 20s if accident is one type of disease,safety is a vaccine.explain with example If a state passes a law for marriage,what can another state do to that law?A. They can change it.B. They can abolish it.C. They can do nothing to it, A scientist is studying the age structure of a small country, which is shown in the following diagram.This graph charts the ages of the population of Nger of both men and women. There are much more young people than old people across both genders.Which conclusion does the diagram most strongly support? A. The population of the country is increasing at a rapid rate. B. The population of the country is relatively stable, and neither increasing nor decreasing significantly. C. In 50 years, about 20 percent of the population will be ages 0 to 4. D. In 50 years, about 20 percent of the population will be ages 50 to 54. 21 is 75% percent of what number? use a sum or difference formula to simplify the expression Sin (x+) Imagine you are the project manager for a team that has just finalized a project and released the product to the client. Now it is time to do an evaluation, and you know that when evaluating the success of a project, there are a number of important evaluation questions to ask. Make a list of five questions that you would include on your evaluation sheet. Make sure that each question is applicable to all people working on the project. Provide a brief explanation of why you would include each question. Jared has been in kindergarten for 6 months. The teacher complains that he runs around the room during class time and is always playing with his pencil. His parents also noticed that he cannot sit still throughout a whole cartoon show. Jared is very talkative. Although his grades and development seem to be right on track for other boys his age, there is concern about his behavior. Brianna has $620 to spend at a bicycle store for some new gear and biking outfits. Assume all prices listed include tax.She buys a new bicycle for $261.04.She buys 3 bicycle reflectors for $13.07 each and a pair of bike gloves for $13.57.She plans to spend some or all of the money she has left to buy new biking outfits for $51.03 each.Write and solve an inequality which can be used to determine xx, the number of outfits Brianna can purchase while staying within her budget. 100 pointsSee attachment below I need help on this In mother tongue how does Amy tan demonstrate language bias toward her mother? Sabes dnde hay un restaurante donde nosotros (1) (poder) comer paella valenciana? No, no conozco ninguno que (2) (servir) paella, pero conozco uno que (3) (especializarse) en tapas espaolas.Question 2Busco vendedores que (4) (ser) bilinges. No estoy seguro de conocer a alguien que (5) (tener) esa caracterstica. Pero ahora que lo pienso, s! Tengo dos amigos que (6) (trabajar) en el almacn Excelencia. Los voy a llamar. Debo decirles que necesitamos que (ellos) (7) (saber) hablar ingls.Question 3 Se busca apartamento que (8) (estar) bien situado, que (9) (costar) menos de $800 al mes y que (10) (permitir) tener perros. why is it bad to export food from undeveloped country?