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richard and davina ate dinner at a restaurant together. davina had a coupon for 25% off their meal. they both agree that they should leave a 20% tip on their meal. however, richard believes they should calculate the tip before taking into account the coupon, and davina believes they should calculate the tip after taking into account the coupon. if their meal costs $48.80 before using the coupon, by how much will the tip increase if they use richard's method instead of davina's method?

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

Carla was trying to decide what to do saturday evening. she has $100 available to spend for the evening. she has narrowed her choices down to these events: braves game, a concert of an artist she likes, or the georgia aquarium. admission to the braves game is $25, hot dogs cost $10, sodas cost $5. the concert costs $25 for admission, $20 for a souvernir t-shirt, and $10 for a soda. the georgia aquarium has the show of a lifetime with an all you can eat and drink that costs $100. carla does not want to take any driving chances, so in addition to the cost of the aquarium, she will also need to pay for her uber/lyft, which is $15 each way. which option should carla choose if she wants to spend the least? based on that choice, what then is carla's oppotunity cost? fully explain your answer in at least one paragraph.

Solve 4 ln x=2ln25 a) x=5 b) x=25 c) x=625