18. during a clothing store's bargain days, the regular price for t-shirts is discounted to $8.25.
you have an additional coupon for $5.00 off, regardless of how many shirts are purchased

a. write a rule for the function p(t) that expresses the final price of t t-shirts with the
discount applied
b. how much would you pay during bargain days for 11 shirs?

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?