Pls help easy 6th grade history

The larger of two number is 4 less than twice the smaller number. the sum is 41. find the numbers

1c) the number 131 is a term in the sequence defined by the explicit rule f(n)=5n-4. which term in the sequence is 131? 2a) write the first four terms of the function f(n)=n^2-1 2b) what is the 10th term of the sequence defined by the explicit rule f(n)=n^2-1 2c) the number 224 is a term in the sequence defined by the explicit rule f(n)=n^2-1. which term in the sequence is 224?

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class