The city mayor wants to use the reserved section of a rectangular park for gardening lessons conducted by the city public school. the rest of the park will be turned into a lawn. what will the area of the lawn be?

You can have a lot of ways to solve this problem, but I'm going for solving for the lawn's area directly instead of solving the reserved section and subtracting it from the total area of the whole place. 

First, cut the lawn so that it becomes two shapes: a rectangle, and a triangle. Solve for both areas.

A(r) = lw
A(r) = (14)(16) 
A(r) = 224 square feet

A(t) = bh/2
A(t) = (8)(14) / 2
A(t) = 112 / 2
A(t) = 56 square feet

Add the two areas:

A(r) + A(t) = Area of lawn
224 square feet + 56 square feet = 280 square feet. 

The area of the lawn, therefores, is 280 ft^2.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.