Can anyone please help me with this Operations on Functions Algebra 2 Math Question? Soon as possible!

If f(x) = x^2, and g(x) = 5x, find g[f(3)]

Noor brought 21 sheets of stickers. she gave 1/3 of a sheet to each of the 45 students at recess. she wants to give teachers 1 1/2 sheets each.

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.