Luis and his brother Jose measured their running rate. Luis' rate was 5 feet per second. Jose's rate was 3 feet per second. Luis decided to give Jose a 900 feet head start. How long will it take for Luis to catch up to Jose? Explain.

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

The system of equations graphed below has how many solutions? y = 2x + 2

What situation is an example of an observational study