Https://youtu. be/i39fan8ow-o

Very Sad song for depression :-(

In the image, point a marks the center of the circle. which two lengths must form a ratio of 1 : 2? (options are in the images since thought they were harmful phrases)

Select all the correct answers. what is 221,000,000,000,000,000,000 expressed in scientific notation?

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared