Add these numbers 3x^2+12x^2+1x^2

Which is the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Pyramid shown has a square base that is 18 inches on each side has a surface area of 164 square inches what is the slant height