Show that the proportions a+b/b=c+d/d and a/b=c/d are equivalent.

Pls I need help!

Elm street is straight. willard's house is at point h between the school at point s and the mall at point m. if sh = 3 miles and hm = 4.5 miles, what is the value of sm in miles?

P= price tax is 4% added to the price. which expression shows the total price including tax?

Miranda drove her car 112 miles on a 4 gallons of gas and 182 miles on 6.5 gallons. how many gallons would she need to drive 420 miles?