Claudia buys 12 postcards, 12 stamps, and 1 pen. The postcards cost twice as much as the stamps. The pen costs $1.50. The total cost is \$14.10 . How much doe each postcard cost? answer

Are the corresponding angles congruent? explain why or why not.

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x, y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false