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3 years ago

Sry bout the screen,BUT PLEASE HELP!!!!

Mathematics

2 answers:

Tasya [4]3 years ago

7 0

Answer:

40 mph

Step-by-step explanation:

20 miles in 1/2 hour

1/2 times 2 is 1, so 20 times two is 40 mph

Bumek [7]3 years ago

5 0

It would be 40 miles per hour. That is because if 20 miles is what he can cover in a half hour, than in one full hour he would go twice the amount of time. So 20 times 2 is fourty. So 40 miles per hour is the answer.

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2 years ago

find the value of x if A, B and C are collinear points and B is between A and C. AB= 6x, BC= x-5, AC= 23

Irina18 [472]

Answer:

x=4

Step-by-step explanation:

AB + BC = AC

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Substituting what we know

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2 years ago

If the volume of a sphere inscribed in a cubic box is 36pi, find the surface area of the box

Kruka [31]

Answer:

Surface area of the cube = 216 square units

Step-by-step explanation:

Let the length of a side of a cube = x unit

Diameter of the sphere inscribed in this cube = length of a side of the cube

Volume of the sphere = $\frac{4}{3}\pi r^{3}$

Where r = radius of the sphere = $\frac{x}{2}$ units

36π = $\frac{4}{3}\pi (\frac{x}{2})^{3}$

36π = $\frac{4x^{3}\pi }{24}$

36×24 = 4x³

x = $\sqrt[3]{\frac{36\times 24}{4} }$

x = 6 units

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= 6×(6)²

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= 216 square units

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2 years ago