Question

PLEASE HELP, WILL GIVE 20 POINTS.

Answer 1

Answer: $200cm^{2}$

Step-by-step explanation:

To double the dimensions, you must multiply both the length and width by 2, so instead of just $l*w=a$, you have $2l*2w=b$, which can be simplified even further to $2*2*l*w=b$

Now, multiply the 2s together to get 4, making the equation $4lw=b$. Since $lw$ is $a$, and $b$ is 4 times as much as $a$, you just need to multiply the original area by 4 to get the new area.