Answer:
560 feet
Explanation:
We are given the scale of the model as:
The scale of the model is 1 inch to 70 feet,
His model is 8 inches tall.
The actual height of the Washington Monument is calculated as;
1 inch = 70 feet
8 inches = x feet
Cross Multiply
x = 8 × 70 feet
x = 560 feet
The actual height of the Washington monument is 560 feet.