Leticia charges $8 per hour to babysit. she babysat friday night for 4 hours, and then she babysat again on saturday. she earned a total of $72. how many hours did leticia babysit on saturday? a. equation: 8(4+x) =72 b. equation: 4(8+x) =72 c. 5 hours d. 11 hours

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?

Given the net of the rectangular prism, what is its surface area?

Graph each quadratic function and identify its key characteristics. f(x) = x^2 - 2x - 3