Part of the proceeds from a garage sale was $480 worth of $10 and $20 bills. If there were 3 more $10 bills than $20 bills, find the number of each denomination. $10 bills and $20 bills.
There were

What is the value of the expression below? (81^2)^1/8

Multiply and simplify. 2x2y3z2 · 4xy4x2 how to do?

Find a parametrization for the curve「and determine the work done on a particle moving along γ in r3 through the force field f: r^3--r^3'where f(x, y,z) = (1,-x, z) and (a) im (γ) is the line segment from (0,0,0) to (1,2,1) (b) im (γ) is the polygonal curve with successive vertices (1,0,0), (0,1,1), and (2,2,2) (c) im (γ) is the unit circle in the plane z = 1 with center (0,0,1) beginning and ending at (1,0,1), and starting towards (0,1,1)