usage of most types of
1].
In today’s era, the use of images has replaced most types of visual media.

Is this sentence grammatically correct, please?.

2].

Reading has been less important than it used to be.

Is this sentence grammatically correct?. Can it be used in a formal context?. I mean for an academic essay.

Question

usage of most types of
1].
In today’s era, the use of images has replaced most types of visual media.

Is this sentence grammatically correct, please?.

2].

Reading has been less important than it used to be.

Is this sentence grammatically correct?. Can it be used in a formal context?. I mean for an academic essay.

Answer

Hi Javi, 
I read your sentence and they both seem correct to me. They would be good enough, in my opinion, to use in an academic essay.

Hope this helps :).