1/8(−8c+16)−1/3(6+3c) find the difference

Janets dinner costs 7.50. if she wants to leave a 10% tip how mich extra should she leave

The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

You're locked out of your house. the only open window is on the second floor, 25 feet above the ground. there are bushes along the edge of the house, so you will need to place the ladder 10 feet from the house. what length ladder do you need to reach the window?