An architect built a scale model of a shopping mall. On the model, a circular fountain is 21 inches tall and 17.5 inches in diameter. If the actual fountain is to be 6 feet tall, what will its diameter be?

The diameter is 5ft

Step-by-step explanation:

Given

Required

Determine the diameter when the height is 6ft

Recall that the scale is a ratio of height to diameter;

So 6ft height can be represented on the following scale model;

Convert to fraction

---- (1)

Recall that:

Convert to fraction

---- (2)

Equate (1) & (2)

Cross Multiply

Hence, the diameter is 5ft

its 4 because 2 times 2 is 4, if you double the number two you get four

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25