Leslie drove 20 miles at 5 mph. how many minutes did it take to make the drive.
how you do it

a) 20/50 miles
b) 2 1/2 min
c) 24 min
d) 30 min

Aline has a slope of 1/4 and passes through point (0.4,-1/2). what is the value of the y-intercept?

Charlie tosses five coins.what is the probability that all five coins will land tails up.

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?