So (3x^2+4)-3(2x^2+6x-5) simplifies to 3x^2+4-6x^2-18x+15 how does that simplify to -3x^2...+21 shouldn’t it be 19

What set does not contain -3 the set of all real numbers the set of all integers the set of all whole numbers the set of all rational 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?

How do you write something in scientific notation?