2 years ago

4 less than the quantity of 8 times n

Mathematics

1 answer:

kirza4 [7]2 years ago

6 0

8n-4
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:)

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If seven cats killed seven rats in 7 min, how many cats are needed to kill 200rats in 100min

Aleksandr [31]

Maybe 400, but I’m not quite sure

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3 years ago

Suzy is shopping at a book sale.The table show prices for paperback books.

Salsk061 [2.6K]

Answer:

6,9

Step-by-step explanation:

Got it right on edg

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2 years ago

Upper AA 66-ft-tall fence runs parallel to a wall of a house at a distance of 3030 ft. Find the length of the shortest ladder t

Mkey [24]

Answer:

0.33 ft

Step-by-step explanation:

From the diagram, triangle ACE is similar to triangle BCD.

Therefore,

$\frac{b}{30+b} = \frac{6}{a}$

$a=\frac{6(30+b)}{b}$

Let the Length of the Ladder, L

Using Pythagoras theorem

$L^{2}=(30+b)^{2}+(\frac{6(30+b)}{b})^{2}$

$L^{2}=\frac{(30+b)^{2}(36+b^{2})}{b^{2}}$

$L=\sqrt{\frac{(30+b)^{2}(36+b^{2})}{b^{2}} }$

$L=\frac{30+b}{b}\sqrt{b^2+36}$

To find the least value, we have to equate the derivative of L to 0.

$L^{1}=\frac{b^{3}-1080}{b^{2}\sqrt{b^2+36}}$

Therefore:

b³-1080=0

b³=1080

b=10.26

The minimum length of the ladder is:

$L=\frac{30+10.26}{10.26}\sqrt{10.26^2+36}$

=0.33 ft

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3 years ago

Find the value of two numbers if their sum is 18 and their difference is 2

coldgirl [10]

Let X be the first and second number.
X+X = 18
+ X-X = 2
2X = 20 (divide both sides by 2
X = 10
Substitute the values to get the second number
10+X = 18
X = 18 -10
X = 8
Therefore, the numbers are 10 and 8

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3 years ago

Read 2 more answers

Answer the two questions.

juin [17]

Answer:

Step-by-step explanation:

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3 years ago