How do i solve an equation with variables on both sides with a negative?

Add the two expressions 3.8b - 7 and 2.9b + 9 enter your answer in simplified form

What is the fewest number of full weeks briyana would have to work to have enough money? 8 weeks9 weeks 10 weeks11 weeks

For each polynomial, determine the degree and write the polynomial in descending order. a. –4x^2 – 12 + 11x^4 b. 2x^5 + 14 – 3x^4 + 7x + 3x^3