PLEASE HELP! ASAP! 20 Points! And I will mark brainliest!!! I need #’s 42, 47, and 48!

The area of a circle is equal to 1 dm². find the radius of the circle.

Ingredient c: 1/4 cup for 2/3 serving or ingredient d: 1/3 cup for 3/4 serving which unit rate is smaller

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.