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aleksandr82 [10.1K]
3 years ago
12

What is the value of 20 + 3(7+4) + 5 +2(7+9)

Mathematics
2 answers:
deff fn [24]3 years ago
6 0
Follow the order of operations.

First do what is inside the parenthesis

20 + 3(7+4) + 5 + 2(7+9)
20 + 3(11) + 5 + 2(16)

Next, do the multiplication

20 + 3(11) + 5 + 2(16)
20 + 33 + 5 + 32

Then add

20 + 33 + 5 + 32 = 90
aleksandrvk [35]3 years ago
4 0
The answer is 90 use order of operations

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The volume of the composite figure is the third option 385.17 cubic centimeters.

Step-by-step explanation:

Step 1:

The composite figure consists of a cone and a half-sphere on top.

We will have to calculate the volumes of the cone and the half-sphere separately and then add them to obtain the total volume.

Step 2:

The volume of a cone is determined by multiplying \frac{1}{3} with π, the square of the radius (r²) and height (h). Here we substitute π as 3.1415.

The radius is 4 cm and the height is 15 cm.

The volume of the cone :

V = \frac{1}{3} \pi r^{2} h = \frac{1}{3} (3.1415)(4^{2} )(15) = 251.32 cubic cm.

Step 3:

The area of a half-sphere is half of a full sphere.

The volume of a sphere is given by multiplying \frac{4}{3} with π and the cube of the radius (r³).

Here the radius is 4 cm. We take π as 3.1415.

The volume of a full sphere \frac{4}{3} \pi r^{3} = \frac{4}{3} (3.1415) (4^{3}) = 268.07 cubic cm.

The volume of the half-sphere =\frac{1}{2} (268.07) = 134.037 cubic cm.

Step 4:

The total volume = The volume of the cone + The volume of the half sphere,

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Answer:

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Step-by-step explanation:

d⁴ − 81

Factor using difference of squares.

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Factor using difference of squares again.

(d − 3) (d + 3) (d² + 9)

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