What is the greatest common factor of the expression 12x^4+18x^2

1mile equals approximately 1.6 kilometers. which best approximates the number of miles in 6 kilometers?

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.

Which best describes the function on the graph? direct variation; k = −2 direct variation; k = -1/2 inverse variation; k = −2 inverse variation; k = -1/2