1. what is 0.783 written in scientific notation?

2. solve the following and express your answer in scientific notation.

(8.23 x 109) + (9.1 x 109)

3. one blue whale weighed 4.2 x 105 pounds while another weighed 2.6 x 104. find the difference in weight, and express your answer

The longer leg of a 30° 60° 90° triangle is 16 times square root of three how long is a shorter leg

What is the lcm of 16 and 40 ? 24 and 40 ?

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.