If the height of a triangle is 12 and its area is 54, what is its base? 4 6 9 12 15 question 2 if a = 8 and b = -7, then (-a) - b = ? -15 1 -1 15 question 3 what is the area of a rectangle with a length of 7 and a width of 4 ? question 4 match each expression with its value if a = 6 and b = -2. -10 -12 12 -24 question 5 how many bags of weed & feed fertilizer would you need to cover a rectangular yard that measured 40 feet by 90 feet, if each bag covered 4000 square feet? 4 bags 3 bags 2 bags 1 bag question 6 find the area of a circle with the radius of 7. use 3.14 for 153.86 21.98 43.96 69.0172 question 7 if you had to put up a fence around a circular baseball field, you would need to know the area diameter circumference radius question 8 x = 5, y = 2 and z = 15 evaluate: (xy)2 + z question 9 what is the perimeter of a rectangle with a length of 7 and width of 4 ?