The formula b=28a is used in New England to estimate the minimum furnace output, b, in BTUs, for a modern house with a square feet of flooring.

A) determine the minimum furnace output for a 2200 ft squar modern house

B) Solve the formula for a

b = 28 * 2200

b = 61,600 BTU

a = b/28 = .0357 b

0.0357

A) To determine the minimum furnace output for a 2200 square foot modern house, we can use the formula b = 28a, where a represents the square footage of the house's flooring.

Substituting a = 2200 into the formula, we have:
b = 28 * 2200

To calculate this, multiply 28 by 2200:
b = 61,600 BTUs

Therefore, the minimum furnace output for a 2200 square foot modern house is 61,600 BTUs.

B) To solve the formula b = 28a for a, we need to isolate the variable a.

Start with the formula:
b = 28a

Divide both sides of the equation by 28:
b/28 = a

Therefore, the formula b = 28a can be solved for a as a = b/28.