WEATHER A same-day forecast of the temperature tends to be within 2.25°F of the actual temperature. The forecast for a particular day is 16°F. Let x be the actual temperature. Find the range of possible temperatures for the day when the forecast is 16°F.
(answer should be an inequality)
Please help me really quick!!!

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?