Determine the domain of a function given its equation.

f(x)=1/(x-20)

Let w=23 . what is the value of w + 45 ?

Jamie went to home depot.she bought 25 bags of soil that cost $9 per bag.she bought 15 pots at $8 each, and she bought 23 bags of pebbles at $15 each.she used a coupon that gave her $5 off for every 100 dollars she spent. how much did jamie pay at the end?

Hi, can anyone show me how to do this problem? 100 points for this. in advance