Hey I need help with 3 and 4 please and thank you !

What is the solution to the equation 9^(x+1) =27

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?

True or false look at the picture pls : /