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netineya [11]
3 years ago
10

A first number plus twice second number is 9. Twice the first number plus the second totals 6. Find the numbers.

Mathematics
1 answer:
Andreyy893 years ago
8 0
The first numbers are three and six and the second numbers are 2 and four

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if y varies directly as the square root of x and y=87 when x=625, find y if x =390625. Round off your answer to the nearest hund
natta225 [31]

Answer:

2175

Step-by-step explanation:

y = k sqrt(x)

x = 625

y = 87

87 = k * sqrt(625)

87 = k * 25

87/25 = k

k = 3.48

y = 3.48 * sqrt(390625)

y = 3.48 * 625

y = 2175

6 0
3 years ago
Vf²=vi²+ 2ad <br><br> A) solve for vi<br><br> B) solve for d <br><br> Using the same equation
diamong [38]
A)
               Vf² = vi² + 2ad   Subtract 2ad from both sides
     Vf² - 2ad = vi²              Find the square roots of both sides
√(Vf² - 2ad) = √(vi²)         Cancel out the squares with the square roots
  Vf - √(2ad) = vi               Switch the sides to make it easier to read
                 vi = Vf - √(2ad)

B)                 Vf² = vi² + 2ad   Subtract vi² from both sides
             Vf² - vi² = 2ad           Divide both sides by 2a
    (Vf² - vi²) / 2a = d               Switch the sdies to make it easier to read
                         d = (Vf² - vi²) / 2a
7 0
4 years ago
My rule is: y = 19 - x + 20 <br> Can you write in a simpler <br> form? <br><br> y =
Alex73 [517]

Answer:

y=-x+39

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Cheryl collected data for her mathematics project. She noted that the data set was approximately normal. Select the statement th
oksano4ka [1.4K]

Answer:

MEAN WOULD INCREASE

Step-by-step explanation:

THE AVERAGE IS INCREASED

8 0
3 years ago
if someone deposited 2000 at 6% simple intrest . how long will it be before she has 2600 in her account
den301095 [7]
30. Given problem : You deposited 2 000 dollars, then you will earn 6% simple interest. Question: How long will it become 2 600 dollars. Well, you didn’t mention if it’s an annual interest or monthly interest. But let’s say that it’s a monthly interest, then let’s start solving: => 2000 Is the original amount + 6% interest first month = 2000 * .06 = 120 => 2000 + 120 = 2120 2nd month = 2120 *.06 = 127.2 => 2120 + 127.2 = 2247.2 3rd month = 2247.2 *.06 = 134.832 => 2247.2 + 134.832 = 2382.032 4th month = 2382.032 * .06 = 142.92192 => 2382.032 + 142.92192 = 2524.95392 5th month = 2524.95392 * .06 = 151.497 => 2524.95392 + 151.497 = 2676.45 Thus, on the fifth month she will earn this amount.
8 0
4 years ago
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