3 years ago

Find the surface area of the sphere.

Mathematics

1 answer:

ValentinkaMS [17]3 years ago

7 0

The answer would be .... d hoped i helped

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What is the volume of the cube below? <br> A. 16x^2 <br> B. 4x^2 <br> C. 4x <br> D. 16

bezimeni [28]

Answer:

B. 4x^2

Step-by-step explanation:

Volume of the cube

$= 4 \times x \times x \\ \\ = 4 {x}^{2}$

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3 years ago

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F(x) = 2x² + 8x Find f(-1)

inysia [295]

Answer:

-6

Step-by-step explanation:

2(-1)^2 + 8*-1 = 2*1+8*-1=2-8=-6

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3 years ago

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Which expression correctly simplifies ... (see photo)

Anestetic [448]

Answer:

The last one

Step-by-step explanation:

FInd a common demominator which is 20 and multiply both so it turns into 4 19/20

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3 years ago

Use a table to multiply (–5a)(2a – 1). A) –15a B) 5a2 + 10a C) –10a2 – 5a D) –10a2 + 5a

Varvara68 [4.7K]

Answer:

Step-by-step explanation:

Given the expression (–5a)(2a – 1)

Open the bracket

(–5a)(2a – 1)

= -5a(2a) -5a(-1)

= -10a² + 5a

<em>hence the equivalent expression is -10a² + 5a</em>

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3 years ago

A triangle has two constant sides of length 5 feet and 7 feet. The angle between these two sides is increasing at a rate of 0.9

o-na [289]

Answer: $12.74 ft^2/s$

Step-by-step explanation:

Given

Two sides of triangle of sides 5 ft and 7 ft

and angle between them is increasing at a rate of 0.9 radians per second

let $\theta$ is the angle between them thus

Area of triangle when two sides and angle between them is given

$A=\frac{ab\sin C}{2}$

$A=\frac{5\times 7\times \sin \theta }{2}$

Differentiate w.r.t time

$\frac{\mathrm{d} A}{\mathrm{d} t}=\frac{35\cos theta }{2}\times \frac{\mathrm{d} \theta }{\mathrm{d} t}$

at $\theta =\frac{\pi }{5}$

$\frac{\mathrm{d} A}{\mathrm{d} t}=\frac{35\times cos(\frac{\pi }{5})}{2}\times 0.9$

$\frac{\mathrm{d} A}{\mathrm{d} t}=12.74 ft^2/s$

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4 years ago