The class scores of a history test have a normal distribution with a mean Mu = 79 and a standard deviation Sigma = 7. If Opal’s test score was 72, which expression would she write to find the z-score of her test score? z = StartFraction 72 minus 79 Over 7 EndFraction z = StartFraction 72 minus 7 Over 7 EndFraction z = StartFraction 79 minus 72 Over 7 EndFraction z = StartFraction 7 minus 79 Over 7 EndFraction.

The square root of 9x plus 7 plus the square rot of 2x equall to 7

20 solve 2(4 x + 3) < 5 x + 21. a) { x | x < 9} b) { x | x > -5} c) { x | x > -9} d) { x | x < 5}

The numbers on a football field indicate 10 yard increments. you walk around the perimeter of a football field between the pylons. you walk a distance of 30623 yards. find the area and perimeter of the indicated regions. write your answers as mixed numbers, if necessary. a. one end zone: perimeter: yd area: yd2 b. the playing field (not including end zones): perimeter: yd area: yd2 c. the playing field (including end zones): perimeter: yd area: yd2