Which answer BEST describes the following step function graph? 1 poin
Cost of T-shirts
20+
15
Price Per Shirt
10
5
10
20
50
60 70
80 90
30 40
Number of Shirts
O The price of Jeshirts goes up by $5 when the quantity of T-shirts is 20 or more
It costs $20 per shirt for the first 20 shirts purchased and then drops to $15 per shirt
if you purchase 21-40 shirts.
O It costs $5 per shirt if you buy 40 or more shirts
O It costs $20 per shirt regardless of how many shirt you buy

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?