(2x^3+9x)-(4x^2-15x+7)
(8x+9x)-(16x-15x+7)
(17x)-(1x+7)
16x+7
412 ÷ 20 = 20 boxes with 12 remaining.
Total boxes needed = 20 + 1 = 21
Answer: 21 boxes will be needed.
Answer:
Step-by-step explanation:
(5x+2)/15 = 84/30
5x+2 = 42
x = 8
Answer: observational study
Step-by-step explanation:
Observational study : A study in which an observer analyse one or more characteristics of a population (depends on the objective of the study) by just observing the individuals in a sample of the population, but he / she never influence the variables of interest.
Design experiment : In this experimenter design an experiment with a series of tests to check the change in the dependent variable. Here , the experimenter influences the variables of interest.
Given : A poll is conducted in which 574 high school students are asked about how often they listened to music during the past week.
here , the poll is just observing the interest of students instead of influencing them.
Hence, the study depicts an observational study.
Answer:
If you take one part master solution and add four parts of distilled water, you now have a 20% salt water solution (1:4 ratio). Using the 'parts' method, if you merely add the two numbers of the 'parts' ratio together and then divide that into 100, it will give you the final dilution percentage.
Step-by-step explanation:
