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3 years ago

What is the surface area of a cube with the bottom 6cm

Mathematics

2 answers:

Marat540 [252]3 years ago

4 0

Answer:A=6a^2

Step-by-step explanation:

LuckyWell [14K]3 years ago

4 0

Well a “cube” is a 3D dimensional square. Meaning instead of having 4 sides it has 6. And as you may know the area is all the sides added up. And since we know all angles must be equal. Multiply 4 sides times 6cm and you 24cm.

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Simplify the rational expression. state any restrictions on the variable. n^4-11n^2+30/n^4-7n^2+10

Andrej [43]

For this case we have the following expression:
 $\frac{n ^ 4-11n ^ 2 + 30}{ n ^ 4-7n ^ 2 + 10} 

$
 We are going to make the following change of variables:
 $x = n ^ 2
$
Rewriting the expression we have:
 $\frac{(x ^ 2-11x + 30)}{(x ^ 2-7x + 10)} 

$
Factoring the expression we have:
 $\frac{(x-5) (x-6)}{(x-5) (x-6)} 
$
Canceling similar terms we have:
 $\frac{x-6}{x-2} 
$
Returning the change we have:
 $\frac{n ^ 2-6}{n ^ 2-2} 

$
 The resctrictions of the function are those that make the denominator equal to zero.
We have then:
 $n ^ 2-2 = 0

n = +/- \sqrt{2} 
$
 Answer:
The simplified expression is:
 $\frac{n ^ 2-6}{n ^ 2-2}$
The restrictions are:
 $n = \sqrt{2} 
$
$n = - \sqrt{2}$

7 0

3 years ago

What’s the correct answer for this question?

Korvikt [17]

Answer:

Volume of pyramid = 1/3(Ab)(h)

Where Ab is the area of base, h is height

Volume of cone = 1/3(Ab)(h)

a) Their formula for finding volume is same. Also, their painting heads are same.

b) Pyramids have a tetragonal base while cones have a polygonal base

2) Pyramids

Volume of cone = (1/3) πr²h

Since Area of a circle = πr²

Volume of pyramid = (1/3)(A)(h)

So we can use the formula of a circle in cone's formula

6 0

2 years ago

Read 2 more answers

Petra jogs 5 miles in 40 minutes. At this rate, how long would it take her to jog 7 miles?

Wittaler [7]

(40 min)/(5 mi) = (time)/(7 mi) . . . . . the rates are the same
(7/5)*(40 min) = time = 56 min

At the same rate, it would take Petra 56 minutes to jog 7 miles.

6 0

3 years ago

Read 2 more answers

A. The slope of the curve y=x^3- 1 at the point P(1,0) is .

Ierofanga [76]

Answer:

Step-by-step explanation:

The measure of the slope is $\frac{dy}{dx}$ at x = a