How many square centimetes are in 1.5 square feet

Iam trying to solve a linear equation for the shoe size of someone 84" tall taking into consideration example 1 is 69" tall with a shoe size of 9 and example 2 is 72 inches tall with a shoe size of 11. i understand that the equation should be y=mx+b and that on the graph the answer is (3,2) but i just don't understand how to create the equation to solve for 84-inches and 60-inches tall questions. after two days, i need .

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab