Vera is using her phone it battery life is down to 2/5 and it drains another 1/9 every hour how many will her battery last

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

Write as a product: ac^2–ad+c^3–cd–bc^2+bd

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?