Multi-step equations

I need an equation for:

A class of 4th graders sold tickets to their school play. Each of the 23 students in the class sold 4 tickets. The class earned $644 how much did each ticket cost?

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