Lightning storms can be both scary and fascinating. Lightning is five times hotter than the surface of the sun. When lightning strikes, it heats the air up very quickly. When air gets hot, it expands and
vibrates, Imagine a day in the desert that is so hot, the air above the ground seems to shimmer. Now,
imagine the air in the sky getting hotter than a shimmering desert in a fraction of a second. When this
happens, it makes an extremely loud sound-the sound of thunder
Thunder is
caused
by heat
O caused
O concealed
O transferred
O destroyed
WEXT

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Factor the polynomial, if possible. if the polynomial cannot be factored, write prime. 9n^3 + 27n^2 – 25n – 75

Each of the following data sets has a mean of x = 10. (i) 8 9 10 11 12 (ii) 7 9 10 11 13 (iii) 7 8 10 12 13 (a) without doing any computations, order the data sets according to increasing value of standard deviations. (i), (iii), (ii) (ii), (i), (iii) (iii), (i), (ii) (iii), (ii), (i) (i), (ii), (iii) (ii), (iii), (i) (b) why do you expect the difference in standard deviations between data sets (i) and (ii) to be greater than the difference in standard deviations between data sets (ii) and (iii)? hint: consider how much the data in the respective sets differ from the mean. the data change between data sets (i) and (ii) increased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). the data change between data sets (ii) and (iii) increased the squared difference îł(x - x)2 by more than data sets (i) and (ii). the data change between data sets (i) and (ii) decreased the squared difference îł(x - x)2 by more than data sets (ii) and (iii). none of the above