If I have 25 dollars and want to buy something for 14 dollars and 99 cents how much money will I have left

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

See attachment below and find the equivalent of tan(∠qsr)

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?