Questions in Grade High-school

Questions in Grade High-school

[Done] Jack can paint a house in 5 days, and Richard can paint the same house in 7 days. Working together, how long will it take them to finish the job?

[Done] What is [tex]9x^2 - 24x + 16[/tex]?

[Done] Substitution how do u do it??

[Done] If the angles of a triangle are in the ratio 2:3:7, find the measure of all the angles of the triangle.

[Done] How could you compare the energy carried in two different longitudinal waves?

[Done] Explain why the railroads were not built in a straight line from east to west.

[Done] How do you say "I was born in the Philippines" in Spanish?

[Done] What three civilizations arose after the fall of the Roman Empire?

[Done] Can someone help me in probability? Amanda wrote a computer program that generates two random numbers between one and eleven. When she runs it, what is the probability that both values will be more than three?

[Done] Explain what is meant by the sentence: "Natural selection can act only on existing traits."