ABCD is rotated counterclockwise wise about the origin. by now how many degrees was ABCD rotated

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

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?

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?