Could someone please answer these ASAP. It is for ratios, rates, proportion & percent. The questions are located in the attachments below. Thanks in advance!
(6th grade)

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?