A bag contains 120 marbles. Some are red and the rest are black. There are 19 red marbles for every black marble. How many red marbles are in the bag?

Nine is 12% of which number

The exact value of cos 5pi/12 is: A) 0.99 B) 0.26 C) sqrt2 (sqrt3-1) / 4 D) sqrt2 (sqrt3+1) / 4

Which expresion is equivalent to 30 (1/2x-2) + 40 (3/4y-4)

The half-life of palladium-100, 100pd, is four days. (so half of any given quantity of 100pd will disintegrate in four days.) the initial mass of a sample is one gram. (a) find the mass that remains after 16 days.

P (B) = 1320, P (A∩B) = 1325, P (A|B) = ?

Robert planted 24 daffodil bulbs and 36 tulip bulbs in his garden last winter. If all the bulbs sprout and bloom this spring, what will be the ratio of tulips to daffodils in Robert's garden? Express as a simplified ratio.

F (x) = (x + 2) (x - 6) f (x) = (x - 4) (x+3) f (x) = (x - 12) (x+1) f (x) = (x - 3) (x + 4)

Negitive 2x minus 3 equals 5 what is x equal too

What is - 54 minus - 25

Two triangles have side lengths 3, 4, 5 and 6, 8, 10, respectively. the triangles are similar to each other. a. True b. False