The graph shows the number of paintballs, y, a machine launches in x seconds: A graph titled Rate of Launch is shown. The x-axis label is Time in seconds, and the x-axis values are from 0 to 20 in increments of 4 for each grid line. The y-axis label is Number of Balls, and the y-axis values from 0 to 160 in increments of 32 for each grid line. A line is shown connecting points on ordered pair 4, 32 and 8, 64 and 12, 96 and 16, 128.
Which expression can be used to calculate the rate per second at which the machine launches the balls? (1 point)

fraction 32 over 4

fraction 4 over 32

fraction 128 over 4

fraction 4 over 128

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?