Alan and Austin are truck drivers. The dot plots show the number of deliveries they made per week during 14 weeks that were randomly selected from the previous year.

The interquartile range of Alan's data is , and the interquartile range of Austin's data is . Comparing the values of the interquartile range for Alan’s and Austin's data, data shows more variation in the data values.

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

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?