The annual return of a well-known company has historically had a mean of about 10% and a standard deviation of 21%. suppose the return for the following year follows a normal distribution, with the historical mean and standard deviation. what is the probability that you will lose money in the next year by investing in this company?

The difference between two numbers is one. three times the larger number minus two times the smaller number is 9. what are the two numbers

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?