An blank is a number sentence that uses the equal sign to show that two amounts are equal

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Aadc is formed by reflecting aabc across line segment ac, as shown in the figure. if the length of ac is 4 units, the area of aadc is square units.