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3 years ago

What is the surface area of the square pyramid represented by the net?

Mathematics

2 answers:

AveGali [126]3 years ago

8 0

The area of the square is 36 because 6×6=36
The area of the triangles is 108 because (1/2)(6)(9)=27 27×4=108 because there are 4 triangles.

108+36=144
The correct answer is 144

Hope this helped :)

jonny [76]3 years ago

6 0

Answer:

144

Step-by-step explanation:

i go to k12

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17. The length of a rectangle is 3 inches greater than its width. The perimeter is 28 inches.

Anna11 [10]

Answer:

$\boxed{ \bold{ \sf{ width \: of \: a \: rectangle = 5.5 \: inches}}}$

$\boxed{ \bold{ \sf{length \: of \: a \: rectangle =8.5 \ \: \: inches}}}$

Step-by-step explanation:

Let the width of a rectangle be 'w'

Length of a rectangle = w + 3

Perimeter of a rectangle = 28 inches

To find : dimensions of the rectangle ( length and width )

Finding the width of a rectangle ( w ) 

$\boxed{ \sf{perimeter \: of \: a \: rectangle = 2(l + w)}}$

$\dashrightarrow{ \sf{28 = 2(w + 3 + w)}}$

$\dashrightarrow{ \sf{28 = 2(2w + 3)}}$

$\dashrightarrow{ \sf{28 = 4w + 6}}$

$\dashrightarrow{ \sf{4w + 6 = 28}}$

$\dashrightarrow{ \sf{4w = 28 - 6}}$

$\dashrightarrow{ \sf{4w = 22}}$

$\dashrightarrow{ \sf{ \frac{4w}{4} = \frac{22}{4} }}$

$\dashrightarrow{ \sf{w = 5.5 \: inches}}$

Width of a rectangle = 5.5 inches

Now, replacing / substituting the value of w in order to find the length of a rectangle 

$\sf{ length = 3 + w}$

$\dashrightarrow{ \sf{length = 3 + 5.5}}$

$\dashrightarrow{ \sf{length = 8.5 \: \: inches}}$

Length of a rectangle = 8.5 inches

Hope I helped!

Best regards! :D

4 0

3 years ago

Which of the following number has terminating has terminating decimal expansion ?

Irina-Kira [14]

It would be (b) 3/5 because
Terminating decimal is a decimal with a definite amount of digits, meaning that it stops after a certain digit.
The other answers:
(A) 3/7 = 0.42857143.....
(C) 1/3 = 0.333333333333.....
And (D) = 0.27272727272.....

And only 3/5 (B) stops after a certain digit because it's decimal value is 0.6.
Hope this helps!

7 0

3 years ago

How to solve a system of equations using elimination

mestny [16]

In order to use the elimination method, you have to create variables that have the same coefficient—then you can eliminate them. Multiply the top equation by 5. Next add theequations, and solve for y. Substitute y = 10 into one of the original equations to find x

3 0

3 years ago

Read 2 more answers

Write an equation in slope-intercept form for the line with slope –3 and y-intercept -1.

Allushta [10]

Answer:

y = -3x - 1

Step-by-step explanation:

Slope-intercept form is y=mx+b, where m is the slope and b is the y-intercept.

Substitute the given values, -3 = m and -1 = b.

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2 years ago