Jim & Sandy each make a flashlight from identical batteries and bulbs as shown below. Sandy's flashlight contains a concave mirrored reflector, while Jim's does not. Whose flashlight shines more light on a wall 5
meters away? How come?

Zoe decided to measure the hand length of each of her classmates. first she marked a line across each student's wrist and lined up a ruler from this mark to the top of the middle finger to measure the length. then she recorded the measurements in the table below. marla did this the same way for each classmate, and then zoe used this ruler to measure each straight line and record the data below. this data is invalid. what is the most likely reason why it is invalid? the ruler is marked in centimeters, but zoe recorded data in inches. the range of lengths is too wide, so zoe must have misread the ruler. marla’s complicated measuring procedure was overly confusing. marla could have been inconsistent while drawing outlines of fingers.

What is the average speed of a car that traveled 300.0 miles in 5.5 hours

Collin would like to use the data a coworker has entered in a database. the problem is the coworker's database software is different from collin's. collin should