I need help with finding the sum of (x^4 + 2x^3 - 7x - 9) + (x^5 - 2x^4 + 8x + 18) in standerd form my answer is x^5 - x^4 + 2x^3 + x^2 + 9
is this correct

What signals you that factoring by grouping is the best method to use when factoring a problem?

A) if $50000 is invested in a bank account that pays 9.3% of interest compounded on a six-monthly basis, how much money will be in the account after 3 and 12 years? b) if matusalen's father had put $2.0 in the bank when he was born and there, how long would matusalen have had to his death (969 years later) if the interest was 7% per year composed each month and weekly?

Write the expression in complete factored form. 5n_(c - 3) - n(c - 3) =