Mathematical Concepts and Problem Solving

If Miss Smith's income in 1990 was $30,000, what would her income be in 1991 if it increased by 20%?

What was Miss Smith's total income for 1990 if she earned $17,500 in the first half and $20,000 in the second half?

Which of the following statements is sufficient to determine Miss Smith's income in 1991?

If Miss Smith's income for 1991 was $7,500 more than 1990, and her 1990 income was $37,500, what was her income in 1991?

In a coordinate plane, if the coordinates of point Q are (3, 4) and point P are (-2, -1), what is the slope of the line connecting these points?

What is the formula to calculate the slope of a line given two points (x1, y1) and (x2, y2)?

What is the change in y over change in x for a line with points (c, d) and (a, b)?

If car X is traveling at 50 mph and car Y at 40 mph, how long will it take for car X to be 2 miles ahead of car Y?

If car X was 1/2 mile ahead of car Y 3 minutes ago, how long will it take for car X to be 1 mile ahead?

If car X is 1 mile ahead of car Y, and both are traveling at constant speeds, how many minutes will it take for car X to be 2 miles ahead if car X travels 10 mph faster than car Y?