It costs $15 to send 3 packages through a certain shipping company. consider the number of packages per dollar.
a. find the constant of proportionality for this situation.
b. write an equation to represent the relationship.

If the measure of angle 1 is 110 degrees and the measure of angle 3 is (2 x+10 degree), what is the value of x?

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

Imogene invested $8,000 in a bank account that pays 8 percent simple interest at the end of each year. her friend invested the same amount in stocks where the growth of the investment is represented as 2,000 times the square root of 2 less than the time lapsed in years. if y1 and y2 represent the amount earned in dollars and t is the time lapsed in years, which system of equations correctly represents the situation?