1 Answer

Joshua Spence · Answer 1 · 2022-09-13T20:20:12+0000

Explanation:

8.

Let the number is x. A number minus 7 is (x-7). It is doubled to get 86. So,

$(x-7)^2=86\\\\x-7=√(86)\\\\x-7=\pm 9.27\\\\x-7=9.27\ and\ x-7=-9.27\\\\x=16.27\ or\ x=-2.27$

The number can be 16.27 or -2.27.

9.

The diameter of the cylindrical tank, d = 20 ft

Radius, r = 10 ft

It is filled with oil to a depth of h feet.

The volume of a cylindrical shaped object is given by :

$V=\pi r^2 h$

Put the given values,

$V=\pi (10)^2h\\\\V=3.14* 100* h\\\\V=314h\ ft^3$

So, the volume of the tank is equal to
$314h\ ft^3$ .

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