13. Subtract the polynomials(-4s^2 + 3s + 4)- (7s^2 +4)=(Simplify)15. Add(4r^4 ?

13. Subtract the polynomials(-4s^2 + 3s + 4)- (7s^2 +4)=(Simplify)15. Add(4r^4 ? 2r^3 + 2r^2 + 11r-7)+(r^5+ 10r^3 + 6r^2 -2r +5)+(-7r^4 + r^2 ? 7r ? 8)(simplify)16. Multiply(v+ ?1)(v+1/4)(Simplify)17. Foil(2x^8 ? 8)(x^9-1)18. Sovle15x^4 ? 19x^2 + 6=0The solution is x=____20. Multiply(8x+2)(8x^2 + 6x +4)21. Solve8/v= 9/v- 1/11The solution is ____22. If the sides of a square are lengthened by 7cm the area becomes 196 cm^2. Find the length of a side of the original square.The length of a side of the original square is ____ cm.23. Evaluate the polynomial for x=2.3x^2 ? 5x + 524. Use the quadratic formula to solve the equation. 2x^2-3x=3The solution set (____)27. Multiply and simplify. Assume variables represent nonzero real numbers.A^16 * a^028. Multiply and simplify. (Type exponential notation with positive exponents)49c^2/4c^2-16c+16 * 4c-8/7c29. Divide and simplify h^9/h^12 ( type exponential notation with positive exponents)30. Divide and simplify.5y-15/21 divided y-3/77(Simplify your answer. Use integers or fractions for any numbers in the expression.)31. Jack usually mows his lawn in 6 hours. Marilyn can mow the same yard in 3 hours. How much time would it take for them to mow the lawn together?32. Simplify by factoring. Assume that all expressions under radicals represent nonnegative numbers. (Type an exact answer using radical as needed)Sqrt 48a^2b34. Solve. X^2 +6x-4=036. Divide.(20b^3 + 17b^2 + 22b +45) / (4b+5)37. Simplify by removing factors of 1.8p^2 + 8p/ 72p^2+ 64pThe simplified form is ___