13- A student finds the slope of the line between (9, 13) and (14, 17). She writes
What mistake did she
14 - 9
make?
a. She mixed up the x- and y-values.
b. She used y-values where she should have used x-values.
c. She did not keep the order of the points the same in numerator and the denominator.
d. She should have added the values, not subtracted them.

Choose the correct slope of the line that passes through the points (1, -3) and (3, -5)

1- is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis. 2- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis. 3- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in part b?

Are triangles the congruent? write the congruency statement.what is the congruency that proves they are congruent? what is the perimeter of ∆pqr?