The distance from earth to the moon is 384,400 kilometers. what is this distance expressed in scientific notation?

3.844e5 kilometers
3.844 × 105 kilometers
3.844e-5 kilometers
3.844e-6 kilometers
3.844 × 106 kilometers
3.844e6 kilometers
3.844 × 10-6 kilometers
3.844 × 10-5 kilometers

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

Florence price's brownies and more sells all types of cookies and pastries. on tuesdays, they markdown all brownies 75% to a sale of $1.50 a dozen. find the selling price and the markdown of a dozen brownies.

Polygon abcde is reflected to produce polygon a′b′c′d′e′. what is the equation for the line of reflection?