Use a 10-by-10 grid to solve. what percent of 400 is 20?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Is the product of two rational numbers irrational or rational? first, make a hypothesis by multiplying two rational numbers. then, use variables such as x=a/b and y=c/d and the closure property of integers to prove your hypothesis.

Find the missing dimension! need asap! tiny square is a =3025 in ²