Serena had 7 4/9 yards of tape. she used 2 1/9 yards to attach a sign to the wall. how many yards of tape does serena have left? express your answer in simplest form.

How do the number line graphs of the solutions sets of -23 > x and x-23 differ?

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?

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?