A total of $10,000 is invested into funds pink 5% and 7% annual interest the combined interest is $644 how much money was invested in the 7% account

Although changes result from business transactions, the equality of the fundamental bookkeeping equation must remain. t/f

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤

The square root of 9x plus 7 plus the square rot of 2x equall to 7