I need help with my test plz real answers

Solve the system of equations. y= 2x y= x^2 - 15

Write the slope-intercept form of the line that passes through the point (1, 0) and is parallel to x - y = 7. t

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables