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horrorfan [7]
3 years ago
10

suppose the population of a certain city is 5355 thousand. It is expected to decrease to 4566 thousand in 50 years. Find the per

cent decrease.
Mathematics
1 answer:
xz_007 [3.2K]3 years ago
5 0

Answer: 14.7338936% decrease

\frac{5355}{100} = \frac{4566}{x}

cross-multiply

85.2661064 = x

100 - 85.2661064 = 14.7338936

Check: 0.852661064 * 5355 = 4566

If permitted, you may round for a simpler (yet less precise and exact) answer.  For instance, rounding to the hundredths would make it ~14.73%.

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If R is the midpoint of QS, QR= 8x-51 and RS = 3x-6, find QS.
sashaice [31]

QS would be 42. So the way i did it was I:

8x-51=3x-6

x=9

Plugged into both equations of QR and RS to then get the answer of 42

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The larger of two numbers is 1 less than 3 times the smaller. their sum is 63. find the numbers
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12) Twenty cubic feet of marble can weigh 3400 pounds, plus or minus 100
andrezito [222]

Answer:

Let's suppose that one cubic foot of marble is x.

20x = 3400

But because the weight has a range of +-100, then 20x is between 3300 and 3500. Write it like this:

3300<20x<3500

Divide by 20:

165<x<175

The meaning of this is that one cubic foot of marble weight between 165 and 175 pounds

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Is 9/5 greater than 1
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Please help me guys as fast as possible I BEG YOU, thanks!
LuckyWell [14K]

Answer:

2u + v - 4w = <40 , -4>

6u - 8v = <-78 , 58>

4v - 7w = <101 , -36>

11u + 3w = <-88 , 89>

Step-by-step explanation:

* Lets find the value of each operation to find its resultant vector

# 2u + v - 4w

∵ u = <-5 , 7>

∴ 2u = <-10 , 14>

∵ v = <6 , -2>

∵ w = <-11 , 4>

∴ 4w = <-44 , 16>

∴ 2u + v - 4w = <-10 + 6 - -44 , 14 + -2 - 16>

∴ 2u + v - 4w = <40 , -4>

# 6u - 8v

∵ u = <-5 , 7>

∴ 6u = <-30 , 42>

∵ v = <6 , -2>

∵8v = <48 , -16>

∴ 6u - 8v = <-30 - 48 , 42 - -16>

∴ 6u - 8v = <-78 , 58>

# 4v - 7w

∵ v = <6 , -2>

∴ 4v = <24 , -8>

∵ w = <-11 , 4>

∴ 7w = <-77 , 28>

∴ 4v - 7w = <24 - -77 , -8 - 28>

∴ 4v - 7w = <101 , -36>

# 11u + 3w

∵ u = <-5 , 7>

∴ 11u = <-55 , 77>

∵ w = <-11 , 4>

∴ 3w = <-33 , 12>

∴ 11u + 3w = <-55 + -33 , 77 + 12>

∴ 11u + 3w = <-88 , 89>

7 0
4 years ago
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