Twice the sum of a number and 40 is 84

Mackenzie needs to determine whether the rectangles are proportional. which process could she use? check all that apply.

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.

Ne height of zak is 1.86 metres. the height of fred is 1.6 metres. write the height of zak as a fraction of the height of fred. give your answer in its simplest form.