Write an explicit formula for an, the nth term of the sequence 63,21,7

Mindy bought 5/8 pound of almonds and a 3/4 pound of walnuts.which pair of fraction cannot be used to find how many pounds of nuts she bought in all.

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

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41