The isotope thulium-167 is used in laser scans for medical treatments. Its rate of decay is −0.075. How many days does it take 500 grams of the isotope to decay to 250 g?

Enter your answer rounded to the nearest tenth, such as: 42.5

all it means is function 3

48 / 6 = x

in this case, x will equal the amount of money in each card!

x therefore will be 8.

trent had $8 in each birthday card.

mrbilldoesmath!

answer: a parabola

steps:

(x-1)(x+4)   = x(x+4) - 1(x+4) = (x^2 + 4x) - (x+4)

                = x^2 +4x -x -4   = x^2 +3x -4

which is a parabola

mrb