Olivia adds 67,828,215 and 8,679,682 she estimates that the sum is 75,000,000. christina estimates that the sum is 77,000,000 which estimate is more reasenable? explane

Use the elimination method to solve the system of equations -x+5y=-4 and 4x+3y=16

The tiles below are pieces of a normal ecg tracing representing a little less than two heartbeats at a resting rate of 80 bpm. arrange the tiles in their correct order. rank from first to last. do not overlap any tiles.

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much