Choose The best sampling technique for each survey explain youre choice

A Umar wants to know at which festival his dance company would like to preform

B sherry wants to find out which canadian actress is the most popular with Ontario teens

Cc laur wants to know which actor her classmates think is the best preformet

D Brurno wants to know which search engine is used most often by oranto hight school students

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?