You participate in a dance-a-thon fundraiser. after your parents pledge $15.50 and your neighbor pledges $8.75, you have $66.55. write and solve an equation to find how much money x (in dollars) you had before your parents and neighbor pledged.

Ametalworker has a metal alloy that is 30? % copper and another alloy that is 55? % copper. how many kilograms of each alloy should the metalworker combine to create 90 kg of a 50? % copper? alloy?

Use the normal approximation to the binomial distribution to answer this question. fifteen percent of all students at a large university are absent on mondays. if a random sample of 12 names is called on a monday, what is the probability that four students are absent?

Use the distributive law to multiply. 3(4x + 5y + 6)