Carl and derrick are part-time employees. they are paid different hourly
rates. one week, carl worked for 15 hours and derrick worked for 20
hours. their combined pay was $640. the next week, carl worked 20
hours and derrick worked 25 hours. their combined pay was $820. what
is carl's hourly pay rate?

10x − 5y + 14 = 0 whats the answer pls

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?

Sun country bus lines has 80000 shares of stock outstanding what would the dividend per share of stock be from a dividends declaration of 109600