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Semenov [28]
3 years ago
9

A positive number is 30 less than its square. Find the number.

Mathematics
2 answers:
FinnZ [79.3K]3 years ago
8 0

Answer:

6

Step-by-step explanation:

6+30=36

6^2=36

ryzh [129]3 years ago
3 0

Answer:

the positive number is equal to  6.

Step-by-step explanation:

from the question which says A positive number is 30 less than its square. Find the number.

let the number be "n"

and the square of the number = n²

So, we have  the expression to be

n = n²-30

n ²-30 -n =0

Re-arrange the equation

n²-n-30=0

the factors of -30 are 5 and -6

so we have

(n+5)(n-6)=0

n+5 =0

n = -5

or

n-6 =0

n = 6

therefore the number can either be -5 or 6.

note we are asked to find the positive number , so the positive number is 6

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Calvin is building a fence. The fence will enclose a 100 square foot area, 10 ft wide by 10 ft long. Calvin can put fence posts
Mashutka [201]

Answer:

20 fence posts.

Step-by-step explanation:

Calvin is building a fence. The fence will enclose a 100 square foot area, 10 ft wide by 10 ft long. Calvin can put fence posts 2 feet apart.

Now, if he puts a fence post at each corner of the building, then considering each length of the building there will be (\frac{10}{2} + 1) = 6 posts along each length.

Now, considering each width of the building there will be (\frac{10}{2} - 1) = 4 posts (excluding the corner posts) along each width.

Therefore, in total there will be (6 + 6 + 4 + 4) = 20 fence post in the total fence. (Answer)

5 0
3 years ago
Will someone please help me here
frez [133]

Hey!

You have to divide the total amount she has by the surface area.

Surface area = 2(wl+hl+hw)

That gives you:

(15 + 18 + 30) \times 2 \\ 63 \times 2 = 126

The surface area is 126 ft. Now divide the total amount she has by the surface area.

1,134 \div 126 = 9

<em>That means she can cover 9 boxes</em>

\framebox{She can cover 9 boxes}

8 0
2 years ago
Find the volume of the sphere to the nearest whole number. Use pi = 3.14. A. 131 in. 3 B. 393 in. 3 C. 4,187 in. 3 D. 523 in. 3
Westkost [7]
The answer is B. That's what I got
5 0
3 years ago
How does tan 135 degrees compare to tan -135 degrees
Anna007 [38]
Evaluating the tangent function for the two values we obtain the following:
tan 135=tan(135+180)=tan 315=-1

next:
tan -135=tan(180-135)=tan 45=1
thus comparing the two we see that tan 135 is negative while tan -135 is positive
3 0
3 years ago
Can someone help me with number 4 please!!
Katarina [22]

Answer:

3

Step-by-step explanation:

3 0
3 years ago
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