How would 39,9000,000,000,000km be written in scientific notation

It takes alden 6 hours to bale all the hay in a field, but his brother, anthony, can do the same job in 7 hours. if they bale all the hay in an entire field together, approximately how long will it take them to complete the job?

1. The table shows the average low temperature at Anchorage, Alaska, from December 17 to December 24. At the bottom of the table is the average temperature for the 8-day period.

Sam practiced piano for 20 minutes on Monday and 43 minutes on Tuesday. Kayla practiced flute for 17 minutes on Monday. Kayla wants to practice the same total amount as Sam. The equation shown represents this situation.

What is the vertex of the quadratic y=-2x^2-4x-5

jscob is in a class of 35 boys and 15 girls. 15% of the students in the class did their homework. how many did ther homework?

What is the degree of the polynomial 3x + 2x2 + 5x? Linear Quadratic Cubic Quartic

A circle has a radius of 7.5 centimeters and a central angle AOB that measures 90°. What is the length of the intercepted arc AB?

CDs, savings accounts, and savings bonds are examples of?

Governments hold the power to: Grant permission for only specific business activity. Grant or refuse permission for many types of business activity. Refuse permission for only government funded activity. None of the above

Write an equation to represent the function. Damon joins a video game membership service. The lifetime membership fee is $50. The first video game is free, then any video game purchased after that is $25.