If -5x = 25, x equals __________.
Answer(s): A
Isolate x by dividing each side of the equation by 5:-5x ÷ -5 = 25 ÷ -5x = -5
A circle measures 12 feet in diameter.What's its area to the nearest foot?
Answer(s): C
The area of a circle equals times the radius squared. The radius is 1/2 the diameter.A = r2. A = 62= 36. If is approximately 3.14, the area of the circle is approximately 3.14 × 36 or 113 feet.
A square box has 6-inch sides.What's its volume?
Answer(s): B
Volume equals length × width × height (V = lwh): 6 × 6 × 6 = 216 cubic inches.
A cylinder has a diameter of 10 inches.What's its approximate area?
The area of a cylinder is A = r2. In this problem, A = 52= (25). Radius is half the diameter.
A cylinder has a diameter of 12 inches and a height of 10 inches.What's its approximate volume?
For cylinders, Volume = r2(h). Since the radius is half the diameter, the problem can be calculated this way: V = (62)10. V = (36)10. If is approximately 3.14, then 3.14 × 36 × 10 = 1,130 cubic inches.
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