For 0 less-than x less-than StartFraction pi Over 2 EndFraction, which expression is equivalent to StartStartFraction sine (StartFraction x over 2 EndFraction) tangent (StartFraction x Over 2 EndFraction) OverOver 1 minus cosine (x) EndEndFraction?

What is the y-coordinate of the solution of the system of equations? [tex]y = 2x + 14 \\ - 4x - y = 4[/tex]y=

What is the scale factor of two similar pyramids with volumes of 64 cubic feet and 8 cubic feet

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?