What is the check digit (d) for the UPC barcode number 2-91273-05213-d?
A. 5
B. 7
C. 9
D. 0

Samantha swam upstream for some distance in one hour. she then swam downstream the same river for the same distance in only 12 minutes. if the river flows at 4 mph, how fast can samantha swim in still water?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Which value of m will create a system of parallel lines with no solution? y= mx - 6 8x - 4y = 12