Questions in Grade High-school

Questions in Grade High-school

[Done] A solution has a pOH of 8.7. What is the pH of the solution? Is the solution acidic, basic, or neutral?

[Done] An automobile engine is 15 percent efficient. How many joules of input work are required to produce 15,000 joules of output work to move the car?

[Done] Which is NOT true about the Black Death? A. It was transmitted through flea bites. B. Trade between Europe, Asia, and other regions caused it to spread and kill millions of people. C. Once symptoms appeared, victims only lived a few more days. D. It caused people to move out of towns and cities to look for work.

[Done] What is the percent mass/volume of a sodium chloride solution made by dissolving 5.0 grams of sodium chloride in 40.0 mL of solution?

[Done] Could someone help, please? The sales \( S \) (in thousands of units) of a cleaning solution after \( X \) hundred dollars is spent on advertising are given by: \[ S = 10(1 - e^{kx}) \] Now, when $325 is spent on advertising, 2300 units are sold. (a) Complete by solving for \( k \). (Round your answer to 4 decimal places) \[ k = \_\_\_\_\_\_ \] (b) What number of units will be sold if advertising is raised to $425? \[ \_\_\_\_\_\_ \text{ Units} \]

[Done] What is 2.05 rounded to the nearest tenth?

[Done] What organelle breaks down and recycles worn-out cells?

[Done] The sum of [tex]5x[/tex] and [tex]2x[/tex] is at least 14.

[Done] Linda is planting pink tulips in a rectangular flower bed that is 2 feet longer than it is wide. She plans to surround the tulips with a border of daffodils that is 2 feet wide. If the total area of the garden is 224 square feet and she plants 36 daffodils per square foot, how many daffodils does she need?

[Done] Which of the following is NOT a shortcoming of current scientific polls? A. They have difficulty measuring the relevance of opinions to the people who hold them. B. They cannot accurately measure the intensity of opinions. C. They have difficulty measuring the stability of opinions. D. They cannot accurately measure political preferences.