Keith bought four new baseball trading cards to add to his collection. The next day his dog ate half of his collection. There are now only thirty - seven cards left. How many cards did Keith start with?

What number should be added to both sides of the equation to complete this square? x^2-10x=7

14 pointslet x be the seats in the small van and y the seats in the large van. how many seats does the large van have? a company uses two vans to transport worker from a free parking lot to the workplace between 7: 00 and 9: 00a. m. one van has 9 more seats than the other. the smaller van makes two trips every morning while the larger one makes only one trip. the two vans can transport 69 people, maximum. how many seats does the larger van have?

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