3. There are 5 routes from station A to station B and 4 routes from station B to C. Answer the questions a. How many different routes are possible from station A to station C?
b. In how many ways can a person travel from A to C and come back from C to A? c. In how many ways can a person travel from A to C and return back to A by using different routes? ​

last option

step-by-step explanation:

given that δdef is right and isoceles,

assuming that side df is the hypotenuse means that de an ef are the other 2 sides that intersect at 90° and are of equal length.

because they are of equal length, we can say that they are congruent

because they intersect at 90°, their slopes must be opposite reciprocals.

only the last option satisfies these conditions.

77

step-by-step explanation:

the answer is 8/21

hope this