A penny is about 5×10−3 feet thick. The One World Trade Center building is about 2,000 feet tall. How many pennies would be in a stack of pennies as tall as the One World Trade Center building?

400000 pennies

Step-by-step explanation:

A penny is about 5×10^-3 feet thick. The One World Trade Center building is about 2,000 feet tall.

The number of pennies that would be in a stack of pennies as tall as the One World Trade Center building is calculated as:

Height of the building ÷ Thickness of a penny

Height of the building = 2000 feet

Thickness of a penny = 5 × 10^-3 feet

Hence:

= 2000feet/ 5 × 10^-3 feet

= 400000 pennies

the answer is 510

step-by-step explanation:

15 • 13 = 195

15 • 12 = 180

15 • 5 = 75

12 • 5 = 60

195 + 180 = 375

375 + 75 = 450

450 + 60 = 510