John brought two 40 cent stamps. how many cents did john spend time on

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)

Ametal rod needs to be 9 feet and 5.5 inches in length. the sections of the poles being used are each 1 foot and 10.5 inches long. how many 1ft 10.5in sections would be needed to complete the 9ft 5.5in metal rod? and how many inches of material will be left?

Explain how you can find the missing fraction in 3 4/5 / (blank) 2 5/7. then find the missing fraction.