How can you use doubles when multiplying with 4 to find 4x8

1 answer:

4 0

4 = 2 * 2

Multiplying by 2 is the same a doubling.
Since 4 is 2 * 2, to multiply a number by 4, double the number twice.

Example:
What is 4 * 100?
Double 100 to get 200.
Double 200 to get 400.
Therefore, 4 * 100 = 400.
By doubling twice, we do the same as multiplying by 4.

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Find the surface area of the solid shown or described. If necessary, round to the nearest tenth. 348m^2 484m^2 180.7m^2 262m^2

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This answer is not an answer choice provided, but I hope this still helps.

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The formula to find the surface area of a cone is $A=\pi r(r+\sqrt{h^2+r^2} )$ . Looking at the formula, we can see there are radius and height. The figure provided gives the radius is 7.1 m and height of 14.6 m. Since we have these values, we can just plug them into the formula.

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Now that we have filled out the formula, we can plug this into a calculator to get the surface area. It is possible to do this by hand, but it is hard to be accurate.

$A=520.5m^2$