Answer:
or 4.47
Step-by-step explanation:
X - y = 2400/6 = 400 where x = speed of plane and y = speed of wind.
x + y = 2400/5 = 480 - flying with the wind
adding the 2 equations
2x = 880
x = 440
Speed of the plane with no wind = 440 mph
Answer:
63
Step-by-step explanation:
2 ways: 18/2 = 9 9 times 7 is 63
18 times 3 =54 plus 9 (because 18/2 is 9) is 63
Let the initial width, depth and height of the prism be w, d, and h respectively.
surface area of a rectangular prism is 2(w * d + w * h + d * h).
After quadrupling the dimentions, new dimentions is 4w, 4d and 4h.
New surface area is 2(4w * 4d + 4w * 4h + 4d * 4h) = 2(16 * w * d + 16 * w * h + 16 * d * h) = 16 * 2(w * d + w * h + d * h)
Ratio of old surface area to new surface area is 2(w * d + w * h + d * h) : 16 * 2(w * d + w * h + d * h) = 1 : 16
