Someone?? Can you help me with this?? Determine the number of roots of each polynomial equation.

1. x⁶+8x⁴-4x+10=0

2. (x+9) (x-9) (x+9) (x-9)=0

3. 5x⁴(x-7)(x²+8)²=0

4. -9x⁷+10x-7=0

5. 8x⁴-6x-9x³=0

Need on this geometry question. explain how you did it.

At the beginning of 1974/75,2 years a man invested #2000 in a bank at 12.5% compound interest, if it degree #650 at the end of each two years to pay his son's school fees, after payment of interest to pay his son's school fees, how much did he have left at the beginning of the 1978/79 school year?

Which is the solution to the inequality? 2 3/52 1/15 b< 3 2/15 b> 3 2/15