Answer:
$94.24
Step-by-step explanation:
Given :
Diameter of circular slab = 18feet
Thickness of slab = 3 inches ; inches to ft = 3 /12 = 0.25 feets
Volume of slab = πd²t/4 = (π*18²*0.25) / 4 = 63.6 ft³
1 cubic yard = 27 feet
Volume in yard = 63.6 / 27 = 2.356 yd³
Concrete = $40 per yd³
Cost = $40 * 2.356 = $94.24
57+3x+6=90degree
60+3x=90
3x=90-60
3x=30
x=30/3
x=10
30 students
Since 18 divided by 30 is .6, you convert .6 to 60% by moving the decimals two places to the right. Hope this helps.
d
3rd option
