Help Please Determine the lowest common denominator for each sum or difference.

Common Denominator: 10
Common Denominator: 12
Common Denominator: 24

13/24+7/12
7/6+(-5/12)
5-7/10
1/8-5/3
3/2-4/5

Adecorative window is made up of a rectangle with semicircles at either end. the ratio of ad to ab is 3: 2 and ab is 30 inches. what is the ratio of the area of the rectangle to the combined area of the semicircles? possible answers: a. 2: 3 b. 3: 2 c. 6: π d. 9: π e. 30: π

Amir wants to proportionally increase the size of a photo to create a poster for his room. the size of the original photo is shown. complete the statement and then answer the question to represent ways that amir can increase the size of his photo.

Can someone me with this? i’m not sure what to put for my equations.