(You might consider this dumb.) I have been struggling with maths lately and I feel like I can't do the simplest of problems, and my mother won't help me as she just thinks I'm being lazy. I'm really struggling with a lesson. I'm in 7th grade. Can someone tell me how to combine like and unlike terms with fractions that have variables? I just can't figure it out and no one can really help me right now.

well to combine like terms you just add up all the numbers with the same variables /letters for example: 3/4y + 3/4y = 1   1/2y

Step-by-step explanation:

answer: -8.2562234e+13

the answer is:

the correct option is the option b.

to calculate the surface area of the right cylinder, we need to use the following formula:

from the picture we know that:

so, substituting and calculting we have:

hence, we have that the correct option is the option b.

have a nice day!