Questions in Grade High-school

Questions in Grade High-school

[Homework Help] A test tube containing CaCO₃ is heated until the entire compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment was 4.40 grams, what was the approximate mass of the empty test tube? A. 20.08 g B. 21.00 g C. 24.50 g D. 25.08 g E. 25.68 g

[Homework Help] Do you think the Palmer Raids were a valid approach for a government to take? Explain.

[Homework Help] Trigonometry pile up. Anyone mind helping me out with this one? Trigonometry is not my strong point. Thanks!

[Homework Help] What is the relationship between a fundamental note and its overtones?

[Homework Help] Students research unicellular, prokaryotic organisms that live in harsh environments such as volcanic hot springs, brine pools, and anaerobic black organic mud. Which of these groups are the students most likely researching? A. Archaebacteria B. Eubacteria C. Plantae D. Protista

[Homework Help] You are an urban planner assessing the growth of a city. Ten years ago, the city's population was 249,583. Its current population is 318,270. By about what percentage has the city grown over the past ten years?

[Homework Help] Mr. Knote, a piano tuner, taps his 440 Hz tuning fork with a mallet. What is the period of the vibrating fork?

[Homework Help] Which describes a spontaneous reaction? A. Positive ΔH B. Negative ΔH C. Positive ΔG D. Negative ΔG E. Positive ΔS

[Homework Help] Some organisms living in a vacant lot include grass, dandelions, mice, grasshoppers, and slugs. Collectively, these organisms represent: A. an ecosystem. B. a community. C. a population. D. a mutualism. E. a biome.

[Homework Help] Solve the equation [tex]7x^2 + 8x + 1 = 0[/tex] using the quadratic formula.