Write and simplify an expression for the perimeter of a triangle 4a-2b+9a-4+7a+3

The perimeter of ? cde is 55 cm. a rhombus dmfn is inscribed in this triangle so that vertices m, f, and n lie on the sides cd , ce , and de respectively. find cd and de if cf=8 cm and ef=12 cm. the answer is not cd=20 and de=15. i have tried that one, it does not work.

After how many years are the salaries offered by company a and company b the sameco. a starting salary $24,000 yearly increase of 3000co. b starting salary $30,000 yearly increase of 2400

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 15,000 miles more each year. marc’s car has a current mileage of 24,000 and he drives 11,000 miles more each year. will the mileages for the two cars ever be equal? explain.