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Andru [333]
3 years ago
13

What is the surface area of the rectangular pyramid below

Mathematics
2 answers:
Kobotan [32]3 years ago
6 0

S=15\times15+4(7.5\times15)=\boxed{675}

Mademuasel [1]3 years ago
5 0

Answer:

Option C is correct.

Step-by-step explanation:

Given:

Length of the base rectangle = 15 unit

Width of the  base rectangle = 15 unit

Height of triangle on the side of pyramid = 15 unit

Length of the base of the triangle = 15 unit

Surface are of the rectangular pyramid = Area of Base + 4 × Area of triangle on side.

Area of base = length × width = 15 × 15 = 225 unit²

Area of the triangle = 1/2 × base  × height = 1/2 × 15 × 15 = 112.5 unit²

Surface Area = 225 + 4 × 112.5  = 225 + 450 = 675 unit²

Therefore, Option C is correct.

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The number 8,046 can be modeled using base ten blocks. How many of each type of block are needed to build the number?
MArishka [77]

Answer:

the first one

Step-by-step explanation:

8 one thousand block is 8000

0 hundreds 000

4 tens. 40

6 ones. 6

8046

7 0
3 years ago
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The price of a cd is $16 if the sales tax is 4% what will be the total price of the cd
djverab [1.8K]
Well u would turn 4 into a decimal. this is 0.04. then multiply it by 16. that answer will be added to the original price 16. this would be the answer.
6 0
3 years ago
Find the missing angles .
Kamila [148]

Answer:

f=60 , c=30

Step-by-step explanation:

there are 2f and 2c in the graph and f=2c

So

f+f+c+c=180

2c+2c+c+c=180

6c=180

c=180/6

c=30

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f=2×30

f=60

5 0
3 years ago
Find the ratio of the sequence 3 9 27 81
Tatiana [17]
The common ratio of the sequence 3, 9, 27, 81 is 3
n to the power of 3
1 to the power of 3 = 3
2             ...             = 9
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7 0
3 years ago
75 POINTS HELP PLEASE
Lady bird [3.3K]
The correct answer is C) (5×10⁴)(1×10²)

Explanation:
The number of trees can be calculated by the formula:
trees = density × area

Consider that the problem says that the researcher makes an approximation, and the answers have numbers written in scientific notation.

The density is 86 trees/km², 
which can be rounded to 100 trees/km² 
and written as <span>1×10².
Therefore, density = </span>1×10² trees/km²

The area of a square can be calculated by the formula:
A = s²
   = 220² 
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which can be roundend to 50000
and written as <span>5×10⁴
Therefore, area = </span>5×10⁴ km²

Now, we can substitute in the original formula:
trees = (1×10²)(5×10⁴)
3 0
3 years ago
Read 2 more answers
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