What is the result of adding -2.9a + 6.8 and 4.4a - 7.3?

Aladder that is 30 ft long needs to reach 27 ft up a building. what should the angle of the vertical be?

Which statement about the relative areas of triangle abd and triangle xyz is true

Elena and her husband marc both drive to work. elena's car has a current mileage (total distance driven) of 15,000 and she drives 23,000 miles more each year. marc's car has a current mileage of 46,000 and he drives 9,000 miles more each year. will the mileages for the two cars ever be equal? explain.