Hi. could i get with the below problem. tia
find the value that completes each proportion.
4/5 = ? /15

How do i solve using pythagorean theorem?

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?

Write the factored form of this trinomial 9x^2+18x-7