39. Un comerciante compra frijol a un campesino, de acuerdo con la siguiente tabla.
cantidad cobrada
100
90
80
70
50
40
30
20
10
numero en kilogramos
1 2 3 4 5 6 7 8 9 10
Número de kilogramos
Qué rango de kilogramos de frijol debe vender el comerciante para
generar una ganancia de entre $138 y $288?​

Can you simplify 4/7? 24 points will be awarded!

Solve this problem! extra ! 3025/5.5 = a/90.75

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?