Hello, what is 420 x 69
Please help me I have been struggling with this math problem all-day

An objects motion is described by the equation d= 4sin (pi t) what will the height of the object be at 1.75 seconds?

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?

Use the elimination method to solve the systems of equations. choose the correct ordered pair. 7x+4y=39