Questions in Grade High-school

Questions in Grade High-school

[Free] Given: \[ \cos A = \frac{\sqrt{21}}{5} \] \[ \sin A = \frac{2}{5} \] What is the exact value of \(\cos 2A\)?

[Free] How many bones does the human skeleton consist of? A. 203 B. 206 C. 216 D. 235

[Free] At 400 K, a volume of gas has a pressure of 0.40 atmospheres. What is the pressure of this gas at 273 K?

[Free] The sum of Kris and Victor's ages is 27 years. In 3 years, Victor will be twice as old as Kris will be. What are their present ages?

[Free] What is the perimeter of a triangle whose sides measure 6, 8, and 10 inches?

[Free] Solve for x. \[ ax + bx = 21 \]

[Free] It takes 56.5 kilojoules of energy to raise the temperature of 150 milliliters of water from 5°C to 95°C. If you use an electric water heater that is 60% efficient, how many kilojoules of electrical energy will the heater actually use by the time the water reaches its final temperature?

[Free] How do you perform a transversal of parallel lines?

[Free] What is the exact volume of the largest cone that can fit into a cube with edges of 10 inches?

[Free] A valid conclusion based on the experience of Japanese Americans during World War II is that in wartime: 1. First-generation immigrants become security risks. 2. Constitutional liberties may be limited. 3. Loyalty oaths are necessary to protect national interests. 4. Fear and uncertainty do not interfere with normal life.