Find the distance between (4, −8) and (7, −1). write your answer using a radical sign.

A(xA, yA); B(xB, yB)

AB=√[(xB-xA)²+(yB-yA)²)]

A(4, −8) and B(7, −1)

AB=√[(7-4)²+(-1+8)²)]

AB=√(9+49)

AB= √58

9514 1404 393

  60 ft

Step-by-step explanation:

The formula for the area of a trapezoid is ...

  A = 1/2(b1 +b2)h

Fill in the given information and solve for h.

  8400 ft² = (1/2)(280 ft)h

  h = 8400 ft²/(140 ft) = 60 ft

The altitude of the trapezoid is 60 feet.