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3 years ago

Calculate the surface area of a solid box in the shape of a cube with side length 7cm.

Mathematics

2 answers:

goldfiish [28.3K]3 years ago

8 0

Step-by-step explanation:

a=7

=6a^2

=6×(7)^2

=6×49

=294

melamori03 [73]3 years ago

5 0

Answer:

Surface area of the cube = 294cm^2

Step-by-step explanation:

A cube has the same side lengths for every side

Surface area of one face is length * length

7 * 7 = 49cm^2

A cube has 6 faces

49 * 6 = 294cm^2

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Find the number that belongs in the green box.<br><br>Round your answer to the nearest tenth

Umnica [9.8K]

Answer:

134.5 degree

Step-by-step explanation:

first find the remaining side of a triangle

BY using cosine rule

C^2=A^2+B^2-2ABcosx

apply square root both sides

√c^2 =√[4^2+10^2-2(4)(10)cos29]

C=√(116-69.96958)

C=√46.03

C=6.8

Now find angle using cosine rule

C^2=A^2+B^2-2ABcosx

10^2=4^2+6.78^2-2(4)(6.78)cosx

100=16+45.9684-54.24cosx

100=61.9684-54.24cosx

100-61.9684=-54.24cosx

(38.0316)/-54.24=(-54.4cosx)/-54.24

-0.70117=cosx

X= cos inverse of -0.70117

x=134.5 degree

5 0

2 years ago

Read 2 more answers

A normal distribution has a mean of 15 and a standard deviation of 2. Find the value that corresponds to the 75th

Arada [10]

I am sorry, I am so confused
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7 0

2 years ago

Christine wants to use the net below to create a three-dimensional design for art class.

NikAS [45]

is it 46 ??? because i did the work and don't feel like explaining

4 0

2 years ago

G use part 1 of the fundamental theorem of calculus to find the derivative of the function. sqrt(4+7t)

uysha [10]

Let y = √4+7t
then u= 4+7t
y=√u = u^½

du/dt= 7
dy/du = ½U^-½

dy/dt = du/dt • dy/du
= 7×½U^-½
= 7/2√U
= 7 / (2{√4+7t})

6 0

3 years ago

If a=22.3 and B=47°18’ find c (picture provided)

igor_vitrenko [27]

Answer:

d. 32.9

Step-by-step explanation:

To find c, we'll use the Law of Sines that says:

$\frac{a}{sin(A)} = \frac{c}{sin(C)}$

And we'll isolate a to get:

$c = \frac{sin(C) * a}{sin(A)}$

We first need to find A, which is easy. The sum of the interior angles of a triangle is 180 degrees... and we already have 2 of them, so:

A = 180 - 90 - 47.3 = 42.7

(converted 47°18' to 47.3)

Then we will plug-in the information we already have

$c = \frac{sin(90) * 22.3}{sin(42.7)} = 32.88$

So, let's round it to 32.9 to match the answer number D.

8 0

3 years ago