Questions in Grade High-school

Questions in Grade High-school

[Done] Point O is the center of the circle in the diagram. What is m∠BCA?

[Done] What is the value of x?

[Done] Complete the square for the equation [tex]a^2 - 8a + 15 = 0[/tex].

[Done] What fraction of £1 is 72p?

[Done] Can anybody help by forming and solving this equation? Please show steps and working. A train has 180 passengers. At the first stop, X passengers get off and 24 get on. At the second stop, half of the passengers get off and 40 get on. There are now 134 passengers. How many passengers got off at the first stop (X)? Thanks for any help.

[Done] A man jogs to the shop and back in half an hour. On the way to the shop, he jogs at [tex]4 \, \text{m/s}[/tex], and on the way back, he jogs at [tex]5 \, \text{m/s}[/tex]. Ignoring time spent in the shop, find the distance to the shop.

[Done] Solve the equation: \[ x^4 + 4x^3 + 7x^2 + 16x + 12 = 0 \]

[Done] Why did the collapse of communism lead to increased mortality in Eastern Europe?

[Done] Write an essay about mobile phones. "Les téléphones portables sont-ils vraiment nécessaires ?" - Introduction - Two advantages and disadvantages - Conclusion

[Done] please help me I'm desperate.