Arelay race has a team of 4 runners who run differnet parts of the race. there are 20 students on your track squad. in how many ways can the coach select students to compete on the relay team?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

Sum is 17 and their difference is 3