7. What is the interquartile range for the following list of data?
1, 13, 15, 4, 1, 12, 6, 12, 6

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

In the given figure ar(adf) =ar(cda) and ar(cdf) = ar(cdf). show that abdc and cdfe are trapeziums.

60 2(x + 2) in the diagram, gef and hef are congruent. what is the value of x?