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3 years ago

Simplify the numerical expression:

Mathematics

1 answer:

arlik [135]3 years ago

3 0

Answer:

A) -0.0125

Step-by-step explanation:

-1/80 (fractional form)

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What is the domain of the set of ordered pairs?

lilavasa [31]

Answer:

Step-, by-step explanation:

For any order pairs (x, y), x is an element of a Domain and y is an element of a Range.

For {(7, -3); (-4, 2); (-1, 0); (2, -4); (0, -6)}

the set {7; -4, -1, 2, 0} is a Domain.

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4 years ago

The surface area of a cylinder is increasing at a rate of 9 pi square meters per hour. The height of the cylinder is fixed at 3

Alekssandra [29.7K]

Answer:

$9\pi \text{ cubic meters per hour}$

Step-by-step explanation:

Since, the surface area of a cylinder,

$A= 2\pi r^2 + 2\pi rh$ ................(1)

Where,

r = radius,

h = height,

If $A= 36\pi\text{ square meters}, h = 3\text{ meters}$

$36\pi = 2\pi r^2 + 2\pi r(3)$

$18 = r^2 + 3r$

$\implies r^2 + 3r - 18=0$

$r^2 + 6r - 3r - 18 = 0$ ( by middle term splitting )

$r(r+6)-3(r+6)=0$

$(r-3)(r+6)=0$

By zero product property,

r = 3 or r = - 6 ( not possible )

Thus, radius, r = 3 meters,

Now, differentiating equation (1) with respect to t ( time ),

$\frac{dA}{dt}= 4\pi r\frac{dr}{dt} +2\pi(r\frac{dh}{dt} + h\frac{dr}{dt})$

∵ h = constant, ⇒ dh/dt = 0,

$\frac{dA}{dt} = 4\pi r \frac{dr}{dt} +2\pi h \frac{dr}{dt}$

We have, $\frac{dA}{dt}=9\pi\text{ square meters per hour}, r = h = 3\text{ meters}$

$9\pi = 4\pi (3) \frac{dr}{dt}+2\pi (3)\frac{dr}{dt}$

$9\pi = (12\pi + 6\pi )\frac{dr}{dt}$

$9\pi = 18\pi \frac{dr}{dt}$

$\implies \frac{dr}{dt} =\frac{1}{2}\text{ meter per hour}$

Now,

Volume of a cylinder,

$V=\pi r^2 h$

Differentiating w. r. t. t,

$\frac{dV}{dt}=\pi ( r^2 \frac{dh}{dt}+h(2r)\frac{dr}{dt})=\pi ((3)(6) (\frac{1}{2})) = 9\pi \text{ cubic meters per hour}$

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3 years ago

How many unit cubes be stacked when used to measure volume

Nuetrik [128]

How much cubes there are and then how much are in that square and then how much inches are in the volume. Hope this helped!

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4 years ago

PLS HELP QUICK!!

Arada [10]

Answer:

Substitute point (4, 8)

y = y1 + m(x - x1)

y = 8 + m(x - 4)

y = 8 + mx - 4m

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y = 8 + (3)x - 4(3)

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3 years ago

Add the polynomials below.<br> (x² + 3x3 – 4x2) +(4x3 + 2x)

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3 years ago