Sketch a diagram (dont draw 5625 squares just a rough sketch) and use an algebraic expression to find the number of squares in the border of a 75x75 grid.
can someone explain how to write the algebraic expression?

It’s d for sure i just did also that’s why

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.