Question

The actual height of the Gateway Arch in St. Louis is 630 feet. A scale model of the arch is 9 inches tall. Which statement(s) are true?

A. The scale of the model is 1 in.:70 ft.
B. The scale of the model is 1 in.:90 ft.
C. The scale factor is 1:630.
D. The scale factor is 1:840.

Answer 1

D the scale factor is 1:840 !!

Answer 2

D. The scale factor is 1:840

Explanation:

Make 630 ft into inches, so 7560

Then make it 9/7560, which simplifies to 1/840