Olivia ran 1.4 miles on Saturday and 2.1 miles on Sunday. How many miles did Olivia run altogether on Saturday and Sunday.

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

What is the maximum of the sinusoidal function

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.