How do I solve this for a and b? 7/b-36=a/72=28/b

We were shown how to do multi steps but not multiple variables.

Triangle XYZ is reflected over its hypotenuse to create a kite. the right triangle has an opposite side=5, adjacent side=12, hypotenuse=13 What is the approximate distance from Y to Y'? Round to the nearest tenth. 4.6 units 5.4 units 8.0 units 9.

Joseph earns $20 for every lawn he mows. Is the amount of money he earns proportional to the number of lawns he mows? What is the answer in the table for 1 lawn mowed

Tyler orders a meal that cost $15 if the tax rate is 6.6% how much will the sales tax be on Tyler's Meal?

13) (3 + 7v2) (3 - 7v2)

How to solve the system of equations that answers as all real numbers?

A newspaper reporter wants to know how popular the hobby of bird watching is in the city. He asked people at the local bird refuge if they watched birds as a hobby. Which of the following best explains whether the reporters data is valid or not?

I am very confused on how to figure out if y = 3/4x is proportional?

Alison wants to buy a mountain bike for $339.12. If she saves $28.26 each month, in how many months will she be able to buy the bike?

At 12 o'clock the temperature was 7°C. The temperature decreased by - 20°C. What is the new temperature?

Ashleys rentals charges $27.50 per hour to rent a surfboard and a wetsuit. Darlas surf shop charges $23.25 per hour to rent a surfboard plus $17 extra for a wetsuit.