The cost of flour varies directly with the mass. Robert bought 6.25 kg of flour for $18.50. What is the constant of variation
A)18.50
B)3.125
C)0.338
D)2.69

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?