16. Use a proportion to solve each question. Use a variable for the unknown quantity.
a) Three bars of soap cost $2.94. What
is the cost of eight bars of soap?
b) On a map, 1 cm represents 150 km.
On the map, how many centimetres
represent a distance of 800 km?

Ineed to learn how to solve this problem

Which statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent? a. use the slope formula to prove the slopes of the opposite sides are the same. b. use the slope formula to prove the slopes of the opposite sides are opposite reciprocals. c. use the distance formula to prove the lengths of the opposite sides are the same. d. use the distance formula to prove the midpoints of the opposite sides are the same.

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle?