A courier service advertises that its average delivery time is less than six hours for local deliveries. A random sample of size 10 of the amount of time this courier takes to deliver packages to an address across town was taken. The true standard deviation is not known. A hypothesis test will be run to determine if there is sufficient evidence to support the courier's advertised claim. What case is best

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3

Simplify. 3(4+4x) (type your answer in with no spaces)

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?