What is the perimeter of a 8 inch by 6 inch rectangle

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?

Convert the mixed numbers into improper fractions. convert the improper fraction to mixed numbers.

Asource of laser light sends rays ab and ac toward two opposite walls of a hall. the light rays strike the walls at points b and c, as shown below: what is the distance between the walls?