exam Maths Puzzle Numerical Ability

how do I factor this polynomial? Thank you for your help :)

64x to the second -81.

Read Solution (Total 0)

exam Other Question

a train leaves station m and travels west at 35 km/hr. One hour later, a faster train leaves station m and also travels west on a parallel track at 40 km/hr. How far from station m will the faster train catch the slower one? Could someone show me these on a graph. graphing inequalities.
1) 4x+y>-8
2) x+4y less than or equal to 4
3) 9x+y<7