Aheartbeat takes 0.8 seconds. how many sec is his written as a faction?

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

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

It is given that the quadratic equation hx²-3x+k=0, where h and k are constants, has roots [tex] \beta \: and \: 2 \beta [/tex]express h in terms of k